Tech Question: 700R4 Behind 402BB - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PackerBacker · 09-02-2011, 11:13 AM

I put the thread on the Truck Tech board, but that board seems to have been abandoned, so I thought I'd link to it from here.

**leddzepp** · 09-02-2011, 01:36 PM

I moved this to engine and drivetrain....hopefully someone will chime in.

**Clyde65** · 09-02-2011, 02:02 PM

I dont think a 700r4 will handle the BB torque, you would need a 4l80 for the 4speed or 400 if a 3speed is needed.

COBRO · 09-02-2011, 02:11 PM

Ive got a 72 that came with a 402 and the rear gears are 3.54 in mine. No the factory never put the 700r4 behind a bbc or a th350 cause they were not built to handle the torque of the bbc. Many have tried this with "built" 700s but they will not last.
CB

Tim240Z · 09-02-2011, 02:18 PM

I have one in my burb, behind a 454. Has lasted a few a few thousand miles so far (got it for a steal) with no issues, but I drive like the little old lady from Pasadena so......
As soon as it fails, it will give me an excuse to get away from these damn slush box pieces of #$#$ and drop in a 6 speed manual.....

Tim

prostreetC-10 · 09-02-2011, 05:39 PM

Im sure you want the OD but the th400 is an inexpensive way to go. They are on every craigslist.
Posted via Mobile Device

NtheFamily · 09-03-2011, 09:46 AM

So there are a lot of people out there saying a 700R4 will not hold up to a BB. Crap, now that calls for more $$$ for me cough up, but I need all the advice I can get from you guys.

So I'm thinking of putting a '77 454 in my '85 4wd that has a 700R4. I've seen a few replys on here calling for a 4l80. I'm taking it that this is a tranny with overdrive (which I would like to keep). So how much $ does one of these run? Is it a straight out swap to where no re-engineering has to take place to install one in place of the 700R4?

Man, should I just build a 383 stroker and sell the 454? Will the 700R4 hold up to the 383? MMMMM...............too much to think about.......

All jokes aside though, any thoughts of yours is very much needed and appreciated.

PackerBacker · 09-03-2011, 11:43 AM

Quote:

Originally Posted by NtheFamily

So there are a lot of people out there saying a 700R4 will not hold up to a BB. Crap, now that calls for more $$$ for me cough up, but I need all the advice I can get from you guys.

So I'm thinking of putting a '77 454 in my '85 4wd that has a 700R4. I've seen a few replys on here calling for a 4l80. I'm taking it that this is a tranny with overdrive (which I would like to keep). So how much $ does one of these run? Is it a straight out swap to where no re-engineering has to take place to install one in place of the 700R4?

Man, should I just build a 383 stroker and sell the 454? Will the 700R4 hold up to the 383? MMMMM...............too much to think about.......

All jokes aside though, any thoughts of yours is very much needed and appreciated.

Well, the 4L80-E is a computer controlled tranny, hence the "E", so you have to have the control unit.

After all I've been reading on this subject, I think my best bet is to save up the $2850 and just get the GV O/UD. I've already got a good THM400 in my truck, i.e., the most durable tranny GM's ever produced for car/light truck application. Why fix what ain't broke, right? I should just improve on it.

NtheFamily · 09-03-2011, 12:17 PM

Quote:

Originally Posted by PackerBacker

Well, the 4L80-E is a computer controlled tranny, hence the "E", so you have to have the control unit.

After all I've been reading on this subject, I think my best bet is to save up the $2850 and just get the GV O/UD. I've already got a good THM400 in my truck, i.e., the most durable tranny GM's ever produced for car/light truck application. Why fix what ain't broke, right? I should just improve on it.

Dang, sounds like the 4l80-E is out of the picture.

**Clyde65** · 09-03-2011, 02:33 PM

$2800? you can get a nice rebuilt 4l80e for around $1K IIRC and about 300 for the controller.

PackerBacker · 09-03-2011, 02:50 PM

Quote:

Originally Posted by Clyde65

$2800? you can get a nice rebuilt 4l80e for around $1K IIRC and about 300 for the controller.

Okay, that sounds like a viable option, but, will it go on my 72 with 402BB, and if so, how much mod would it take?

cableguy0 · 09-03-2011, 04:04 PM

A nasty 383 will also tear a 700r4 to pieces. They can be built to handle a bunch of power but its very very expensive and still they are only moderately reliable at best. If your making any decent power the 4l80e is the way to go. It costs a little more up front but you get what you pay for.

SSC's76 · 09-04-2011, 11:45 AM

depends what do you do with the truck? a 402 isnt exactly a pro street monster engine in stock form. Anyway a 700r4 can live a long happy life behind a bb without any modification.

aintmisbehavinn · 09-06-2011, 12:04 AM

Don't kid yourself about a properly built 700R4 for 1K, 1500.00 installed (who needs a controller?). Corvette servos and extra plates, building a TH350/400's or 4-5 speeds are just putting stints in your heart, read this at Mad Dog transmissions, this stuff breaks rear ends, mine is going in this month:

http://www.maddogtransmissions.com/7...slash-4l60.htm

09-02-2011, 11:13 AM	#1
PackerBacker Registered User Join Date: Aug 2011 Location: Treasure Valley Posts: 19	Tech Question: 700R4 Behind 402BB I put the thread on the Truck Tech board, but that board seems to have been abandoned, so I thought I'd link to it from here.

09-02-2011, 01:36 PM	#2
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,989	Re: Tech Question: 700R4 Behind 402BB I moved this to engine and drivetrain....hopefully someone will chime in. __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

09-02-2011, 02:02 PM	#3
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,540	Re: Tech Question: 700R4 Behind 402BB I dont think a 700r4 will handle the BB torque, you would need a 4l80 for the 4speed or 400 if a 3speed is needed. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!* Last edited by Clyde65; 09-02-2011 at 02:07 PM.

09-02-2011, 02:11 PM	#4
COBRO Active Member Join Date: Jan 2005 Location: RDM,Oregon Posts: 285	Re: Tech Question: 700R4 Behind 402BB Ive got a 72 that came with a 402 and the rear gears are 3.54 in mine. No the factory never put the 700r4 behind a bbc or a th350 cause they were not built to handle the torque of the bbc. Many have tried this with "built" 700s but they will not last. CB

09-02-2011, 02:18 PM	#5
Tim240Z Senior Member Join Date: Jan 2005 Location: LAX area, So Cal Posts: 499	Re: Tech Question: 700R4 Behind 402BB I have one in my burb, behind a 454. Has lasted a few a few thousand miles so far (got it for a steal) with no issues, but I drive like the little old lady from Pasadena so...... As soon as it fails, it will give me an excuse to get away from these damn slush box pieces of #$#$ and drop in a 6 speed manual..... Tim __________________ 1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005)

09-02-2011, 05:39 PM	#6
prostreetC-10 My Carbon Footprint Join Date: Oct 2008 Location: Orygun Posts: 5,527	Re: Tech Question: 700R4 Behind 402BB Im sure you want the OD but the th400 is an inexpensive way to go. They are on every craigslist. Posted via Mobile Device __________________ A quick "pedalfest" *Still getting loose (carb test)* 496 Initial fire up video!

09-03-2011, 09:46 AM	#7
NtheFamily Registered User Join Date: Jul 2009 Location: north Georgia Posts: 50	Re: Tech Question: 700R4 Behind 402BB So there are a lot of people out there saying a 700R4 will not hold up to a BB. Crap, now that calls for more $$$ for me cough up, but I need all the advice I can get from you guys. So I'm thinking of putting a '77 454 in my '85 4wd that has a 700R4. I've seen a few replys on here calling for a 4l80. I'm taking it that this is a tranny with overdrive (which I would like to keep). So how much $ does one of these run? Is it a straight out swap to where no re-engineering has to take place to install one in place of the 700R4? Man, should I just build a 383 stroker and sell the 454? Will the 700R4 hold up to the 383? MMMMM...............too much to think about....... All jokes aside though, any thoughts of yours is very much needed and appreciated. __________________ '65 Chevy Fleetside '85 Chevy 4x4 '92 Chevy s10

09-03-2011, 02:33 PM	#10
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,540	Re: Tech Question: 700R4 Behind 402BB $2800? you can get a nice rebuilt 4l80e for around $1K IIRC and about 300 for the controller. __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

09-03-2011, 04:04 PM	#12
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Tech Question: 700R4 Behind 402BB A nasty 383 will also tear a 700r4 to pieces. They can be built to handle a bunch of power but its very very expensive and still they are only moderately reliable at best. If your making any decent power the 4l80e is the way to go. It costs a little more up front but you get what you pay for. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

09-04-2011, 11:45 AM	#13
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	Re: Tech Question: 700R4 Behind 402BB depends what do you do with the truck? a 402 isnt exactly a pro street monster engine in stock form. Anyway a 700r4 can live a long happy life behind a bb without any modification. __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

09-06-2011, 12:04 AM	#14
aintmisbehavinn Registered User Join Date: Dec 2008 Location: Lawrenceville GA Posts: 64	Re: Tech Question: 700R4 Behind 402BB Don't kid yourself about a properly built 700R4 for 1K, 1500.00 installed (who needs a controller?). Corvette servos and extra plates, building a TH350/400's or 4-5 speeds are just putting stints in your heart, read this at Mad Dog transmissions, this stuff breaks rear ends, mine is going in this month: http://www.maddogtransmissions.com/7...slash-4l60.htm



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