OD Auto Tranmission that can handle a load. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Buford · 01-05-2009, 05:12 PM

What is a good 4-speed auto transmission that can used in my 71 GMC C2500. I was researching the 700r4 but it doesn't seem like it is a sturdy transmission for towing with (camper and small boat). Does anyone have any recommendations? Thanks.

chevy_mike · 01-05-2009, 05:32 PM

If you got the $$$$ a 4L80E is they way to go. They are basically a TH400 that's a 4 speed with overdrive.

The other option which is $$$ is putting a Gear Vendors overdrive setup behind a TH400. Of the two, it's most likely the cheaper route but you're still looking at $2500+.

I'm in the same boat, trying to find a reasonable solution and have yet to find one. I had a 700R4 in my last '68, which worked fine but I never did any hauling/towing with it.

Myself · 01-05-2009, 05:33 PM

Find a late eighties 700r4 and rebuild it with a Turbo 700 kit. It will handle anything you're going to throw at it. I can't remember who offers that kit but it seems like the way to go. Also TCI has a replacement valve body that makes the 700r4 work like a TH350 for fluid pressure. Then the TV cable is used to adjust shift points only. That setup would also be a good choice.

breeh · 01-05-2009, 07:18 PM

I have been running a 700R4 from BTO (not the band) for over 5 years now behind a fairly healthy big block. I have not had a single problem with it. I purchased their level 3. Here is a link:

http://www.bowtieoverdrives.com/cata...m.php?ITEMID=9

Buford · 01-06-2009, 01:27 AM

I'm a little hesitant to go with the gear vendor and TH400. I have a good friend of mine that runs that combo and the gear vendor keeps going out. I was looking at the 700R4 level three and that seems like a stout unit. Thanks for the options, I'll do some research.

Thanks

Dingfodgy · 01-06-2009, 01:37 AM

If you have the $$$ and time- I'm sure Advanced Adapters could fab up some sort of conversion kit to shoehorn in the Allison-1000 6-speed out of a Duramax Silverado. I haven't seen or heard of it being done- yet....so I'm basicallly thinking outloud at this point.

01-05-2009, 05:12 PM	#1
Buford Registered User Join Date: Apr 2008 Location: Los Angeles, CA Posts: 27	OD Auto Tranmission that can handle a load. What is a good 4-speed auto transmission that can used in my 71 GMC C2500. I was researching the 700r4 but it doesn't seem like it is a sturdy transmission for towing with (camper and small boat). Does anyone have any recommendations? Thanks. __________________ Buford - 1971 3/4 ton, Custom Camper, 350 Th, 350 SBC.

01-05-2009, 05:32 PM	#2
chevy_mike Never Ending Projects Join Date: Jul 2006 Location: San Diego, CA Posts: 3,836	Re: OD Auto Tranmission that can handle a load. If you got the $$$$ a 4L80E is they way to go. They are basically a TH400 that's a 4 speed with overdrive. The other option which is $$$ is putting a Gear Vendors overdrive setup behind a TH400. Of the two, it's most likely the cheaper route but you're still looking at $2500+. I'm in the same boat, trying to find a reasonable solution and have yet to find one. I had a 700R4 in my last '68, which worked fine but I never did any hauling/towing with it. __________________ . 1965 C10 Panel, Tiki Express http://www.67-72chevytrucks.com/vboa...d.php?t=506580 SOLD 1968 Chevy C10, Long, Fleetside, Hot Rod Hauler http://67-72chevytrucks.com/vboard/s...d.php?t=313233 SOLD 1965 Chevy C10, Long, Fleetside, Hot Rod C10 http://67-72chevytrucks.com/vboard/s...d.php?t=415702 SOLD We were given two ears and one mouth for a reason... listen twice as much and speak half as often...

01-05-2009, 05:33 PM	#3
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,142	Re: OD Auto Tranmission that can handle a load. Find a late eighties 700r4 and rebuild it with a Turbo 700 kit. It will handle anything you're going to throw at it. I can't remember who offers that kit but it seems like the way to go. Also TCI has a replacement valve body that makes the 700r4 work like a TH350 for fluid pressure. Then the TV cable is used to adjust shift points only. That setup would also be a good choice.

01-05-2009, 07:18 PM	#4
breeh Recovering 67-72 Addict Join Date: Oct 2000 Location: North Bend, WA Posts: 1,788	Re: OD Auto Tranmission that can handle a load. I have been running a 700R4 from BTO (not the band) for over 5 years now behind a fairly healthy big block. I have not had a single problem with it. I purchased their level 3. Here is a link: http://www.bowtieoverdrives.com/cata...m.php?ITEMID=9 __________________ 68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women"

01-06-2009, 01:27 AM	#5
Buford Registered User Join Date: Apr 2008 Location: Los Angeles, CA Posts: 27	Re: OD Auto Tranmission that can handle a load. I'm a little hesitant to go with the gear vendor and TH400. I have a good friend of mine that runs that combo and the gear vendor keeps going out. I was looking at the 700R4 level three and that seems like a stout unit. Thanks for the options, I'll do some research. Thanks __________________ Buford - 1971 3/4 ton, Custom Camper, 350 Th, 350 SBC.

01-06-2009, 01:37 AM	#6
Dingfodgy Lemme show you something!! Join Date: Apr 2007 Location: St.Helens, OR. Posts: 876	Re: OD Auto Tranmission that can handle a load. If you have the $$$ and time- I'm sure Advanced Adapters could fab up some sort of conversion kit to shoehorn in the Allison-1000 6-speed out of a Duramax Silverado. I haven't seen or heard of it being done- yet....so I'm basicallly thinking outloud at this point. __________________ '67 CST-10 LWB ("Crusty") SOLD '67 GMC SWB ("Murdock") 2000 K1500 Suburban ("Betty") '95 BMW 325i ("Joy")

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