Gearing options needed

[mjensen]

So, I'm really trying to decide how I want to gear my beast. Currently, it has a 4 speed, NP205 (I think), 4:10 rear (not orig), 4:56 front (orig). I am planning on going with a 4" lift and 35's.

So, I'm going to stick with the 4:10 ratio but I'm not sure about the tranny. I've thought about swapping in a NV4500, or another option may just add a GV Overdrive unit. It seems like the GV option would be easier, and would probably be about the same costs but I wanted to see if you all had an opinion.

[DirtyLarry]

4:56 with a NV4500 on 35-37’s is a great combination. GV has great products but they tend to work better on 2wd trucks more than 4wd. That is just me .02 cents.

[mjensen]

Well, after seeing what you've accomplished I would gladly take your two cents

[Mike C]

I don't have any issues keeping up with traffic with 4.10 and 35's with my SM465. It runs about 2800-2900 at 70 mph, which is not too bad with a carburetor on a small block. Certainly not bad enough for a $3-$4 THOUSAND dollar investment unless you were planning a bunch of high speed cross country trips. Put it together and drive it before making that decision. Then see what adding 37" tires would do.

[mjensen]

Thanks Mike...I like your logic. I think I'll just find me a 4.10 front to match and get it back together as is.

[space wrangler]

seems like adding the GV unit would make for a really steep rear drive shaft angle. does anyone know how much length it adds to the transfer case? the GV website doesn't appear to give the dimensions of the unit. ..just pictures.

[andrewmp6]

Why the gear vendors are you trying to make it easier on gas on ?

[Mr. 250r]

Why not some extreme low range like a StaK transfer case and a gear vendors underdrive? lol real rock crawling ratios and also good for no gas mileage =-p

[mjensen]

I was really wanting to get an overdrive for the amount of freeway cruising I will be doing. I really don't want to go through all the trouble of doing the tranny swap right now. I think a GV unit is really out of the question for this build.

[kwmech]

If you really want to help your SM465, jump over to the Advance Adapter website and take a look at their overdrive unit...Ranger. It bolts in front of your trans, it is 7.5'' long. It essentially gives you an 8 speed trans and with the t-case 16 speeds. If you are towing in any kind of mountainous situations 2nd and 3rd gear overdrive are awesome. With a 4'' lift it will also help your front driveline angle

[mjensen]

Originally Posted by kwmech

If you really want to help your SM465, jump over to the Advance Adapter website and take a look at their overdrive unit...Ranger. It bolts in front of your trans, it is 7.5'' long. It essentially gives you an 8 speed trans and with the t-case 16 speeds. If you are towing in any kind of mountainous situations 2nd and 3rd gear overdrive are awesome. With a 4'' lift it will also help your front driveline angle

I'm loving that for two reasons, 1 - it's cheaper than a GV unit, and 2 - ANOTHER STICK TO SHIFT!!!! . In all seriousness though does anybody know anybody who has installed and used one of these? That looks like a pretty cool option to me. I would think this would cause some clearance issues with the gear shifter/seat, and the 4WD levers. Any input on that?

[Mr. 250r]

http://www.fordification.com/tech/torque-splitter.htm not in a chevy but might help couldn't find much else

[rogerapage]

I ordered a Ranger overdrive last week for a 4wheel drive with a Sm 465 and 205 . My measurements for the transfer case shifter may hit the edge of a bench seat. I plan to install buckets. The people at Advance seem like good people. This truck is a class project so it may be a few months before it is together.

[86c20]

what about a hole aux trans? one like a spicer?? i think it is a 3051A i may be wrong on the name but it was used in mid rang trucks. gives you a 2;1 under drive 1;1 and a .78 over same as the gear vendors and the ranger spliter. 2 wheel drive use only tho un less you fit a divored tcase in there. seen some of the diesel guys do it and they love it. turn a 4 speed into a 12 speed. and yes it will handle all of the power a gasser can make. think they are rated for 1000 lbs tq. there are bigger ones for more power. would work great in a 4 door long bed more then enough room but has been done on a long bed reg cab. later, mike

[bakerboys]

my 85 k20 has 4.11 gears with 37s and a 400 trans i can smoke the 37s and at 60 i am at 2250 rpm 350 roller engine

have a question though I have a 83 k10 with the 4 speed well really 3 speed with granny gear but the granny gear does not want to stay in gear hard to get in gear and will pop out any suggestions

[snj8198]

Originally Posted by bakerboys

my 85 k20 has 4.11 gears with 37s and a 400 trans i can smoke the 37s and at 60 i am at 2250 rpm 350 roller engine

have a question though I have a 83 k10 with the 4 speed well really 3 speed with granny gear but the granny gear does not want to stay in gear hard to get in gear and will pop out any suggestions

sounds like you have the dreaded 3rd gear pop out. that's worn out syncros sir. time for a rebuild or replace.