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02-04-2020, 09:59 AM | #1 |
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Join Date: Jun 2014
Location: Carson City, NV
Posts: 32
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1970 Gear Change / Transmission Swap
Ok, so I'm tired of going 55 mph on the freeway @ 3100 rpm in my medium duty and I wanted to keep it semi-original, so I did a bunch of searching as to the parts I may need.
I figured the best way would be to raise the gear ratio from my current 6.50:1 to some other factory available ratio. So, over the past year or so, I bought a higher geared third member and a Clark 280VO HD transmission to install. The transmission is NOS and will need nothing, I rounded up the parking brake assembly for it and already found a used shifter assembly off eBay. I will have to rebuild the third member, pictures of that are going to be coming as I do it. Currently I just have the two parts shown and I have not torn anything out of my truck yet. The process of rebuilding and doing the swap is just starting, so here goes...
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
02-04-2020, 11:08 AM | #2 |
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Location: edinburg va
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Re: 1970 Gear Change / Transmission Swap
Keep us posted, this is a great thread to follow, Pat
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02-04-2020, 02:22 PM | #3 |
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Location: Elizabeth WV
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Re: 1970 Gear Change / Transmission Swap
Oh man, I'm drooling over that Clark! What rear gear ratio are you going to swap in?
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02-04-2020, 05:11 PM | #4 |
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Join Date: May 2013
Location: Greenwood, IN
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Re: 1970 Gear Change / Transmission Swap
Wow, awesome snag on the Clark. I'm curious what the gear ratio is too. Any plans to update the brakes too?
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02-05-2020, 09:00 AM | #5 |
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Join Date: Jun 2017
Location: Temperance Michigan
Posts: 375
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Re: 1970 Gear Change / Transmission Swap
I'm along for the ride. I hope to be doing a gear swap before too long also.
This seems like a relevant place to ask, not trying to hijack, someone feel free to pm me instead. How can you tell if you have a locker or not? I have a switch in the cab that says wet/dry. |
02-05-2020, 10:27 PM | #6 |
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Join Date: May 2012
Location: horseheads,ny rust belt
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Re: 1970 Gear Change / Transmission Swap
jack up rear axle . trans in neutral . parking brake off if air . spin tire if the other spins 180* of the way you spin its open .
flip the switch and re-test . if both spin the same way = air locker for big trucks being air .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
02-06-2020, 05:51 AM | #7 |
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Re: 1970 Gear Change / Transmission Swap
Thanks sweetk30
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02-23-2020, 12:23 AM | #8 |
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Join Date: Jun 2014
Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
Ok, did the tranny swap.
Couple of issues, the parking brake is totally different and the rear prop shaft has to be shortened by 3.125" Pulled the shifter, removed PTO shaft, removed front of prop shaft, removed transmission. You DO NOT have to remove bell housing to remove transmission. You CAN get to the two bolts that go into the trans from the front. Remove inspection cover and they are right there! I have a 5.57:1 T170 axle, tore it down also. Found a Detroit "no spin" for this axle on ebay!
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E Last edited by ecbert; 02-23-2020 at 12:30 AM. |
02-23-2020, 12:32 AM | #9 |
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Re: 1970 Gear Change / Transmission Swap
Removed shifter, removed PTO shaft, removed front prop shaft, shot of clutch linkage / bell housing
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
02-23-2020, 12:34 AM | #10 |
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Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
Shifter removed, transmission sliding out, pic of SM 465 next to the Clark. I cant wait to drive this thing!
I was surprised, I thought the rear main was leaking oil but it turned out to be the bearing retainer cover was loose on the SM465 so that was the source of my leak, go figure. The new shifter location is about 1" further rear than the original one, I'm thinking of having the hole moved south 1" by a good body guy I know...
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E Last edited by ecbert; 02-23-2020 at 12:44 AM. |
02-23-2020, 12:41 AM | #11 |
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Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
Also got the T170 torn down
The case half shows some wear as does the anchor and sliding clutch. They were off to the machine shop to get jet washed. What do you guys think of the rust on the ring gear?
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
02-23-2020, 12:45 AM | #12 |
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Re: 1970 Gear Change / Transmission Swap
I have not been getting any emails! I'll have to check my settings...
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
02-23-2020, 09:17 AM | #13 |
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Re: 1970 Gear Change / Transmission Swap
Neither have I.
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Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100 |
02-23-2020, 12:03 PM | #14 |
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Join Date: May 2012
Location: horseheads,ny rust belt
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Re: 1970 Gear Change / Transmission Swap
take a scotch bright zippy pad on die grinder and buff the teeth on the gear and if they have no real pits showing i say run it . if heavy pitting then its up to you .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
02-25-2020, 11:34 PM | #15 |
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Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
I'm going to media blast the ring gear to check and see how deep the rust is, once I get the pinion out to check the bearings.
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
02-27-2020, 08:06 PM | #16 |
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Join Date: May 2012
Location: horseheads,ny rust belt
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Re: 1970 Gear Change / Transmission Swap
no no no ... watch what media you use .
thats a polished surface now and you might trash it . do like i said and just zippy pad scotch bright wheel those teeth only . you will be able to tell just fine this way .
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
04-14-2020, 09:31 AM | #17 |
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Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
I wasn't thinking sand blasting!
I media blasted the ring gear with glass shot, removed the rust, did not damage the mating surface(s). I'll post pictures of the ring gear now but I'm having trouble getting the pinion out of the support. Need to put some heat to it to the pinion flange. I had it in my 25 ton Dake press with 20 tons on it and it will not budge. Transmission is installed, found a shifter for it and had the rod powder coated semi-gloss black. Looks like I may need to move the boot hole back 1" or so or maybe bend the rod (of course after I had it coated I discover this).
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
07-18-2020, 11:17 AM | #18 |
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Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
Ok, back on this project again (finally). Everything is pretty much cleaned up, found all the necessary parts and ordered all the bearings / seals. The carrier is back together and I'm working on the pinion support.
In the process of making a fixture to hold the T170 housing so I can easily work on it using my engine stand. 3/8 thick high tensile steel with triangular braces to help keep it from folding up on me! This drop out third member is very heavy! I figured out the bolt pattern for the carrier housing (it's not uniform, aka it's not perfectly round) and I will post pictures of the completed unit holding the carrier during final assembly.
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
07-19-2020, 01:09 AM | #19 |
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Location: California
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Re: 1970 Gear Change / Transmission Swap
I found a two speed RPO J13 : 15000-LB. 2 SPEED AXLE 4.86/6.61 RATIO on ebay back east and put that it my truck. My truck originally had a 20,000 lbs GVW so the lighter duty carrier kinda ate into that, but it should be fine for the rest of it's life.
Honestly I don't mind if you don't wanna talk about it, but how did you find a NOS 280VO? Back 8-10 years ago I couldn't find one of those used! And you actually rebuilt the carrier, which shows much more knowledge than I have. I just threw it in used(the place I bought it from said I was A-OK). You are basically doing what I dreamt of. Can we see the rest of the truck? |
07-31-2020, 06:32 PM | #20 |
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Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
Sure, here is a picture of the green rig from the front.
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
08-03-2020, 11:29 AM | #21 |
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Re: 1970 Gear Change / Transmission Swap
She's beautiful!
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I may have too many Chevys... Is that possible? 68 c50 pickup build: http://67-72chevytrucks.com/vboard/s...d.php?t=704713 |
08-06-2020, 10:43 AM | #22 |
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Re: 1970 Gear Change / Transmission Swap
Beautiful indeed!
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08-14-2020, 09:16 AM | #23 |
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Location: Carson City, NV
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Re: 1970 Gear Change / Transmission Swap
Ok, I got the rear end fixture made / welded up and I'm starting to put it back together. Carrier installed, I just need to do the pinion support sub assembly and install that, set the bearing preload and backlash. Then I can install it, looking forward to lower RPMs!
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
10-26-2020, 03:14 PM | #24 |
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Re: 1970 Gear Change / Transmission Swap
See below
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E Last edited by ecbert; 10-26-2020 at 03:17 PM. Reason: duplicate text |
10-26-2020, 03:16 PM | #25 | |
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Re: 1970 Gear Change / Transmission Swap
Quote:
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2018 Silverado 6.2 1500 Crew Cab 2011 12 Passenger G3500 1969 369 Nova 1967 Chevelle SS 396 1970 GMC 5500 1991 V3500 Single RR Wheel Gen 6 496 / 4L80E |
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