transmission type poll - The 1947 - Present Chevrolet & GMC Truck Message Board Network

junkyardpartseeker · 08-07-2004, 03:44 PM

As most of you know, I have a 84 suburban with a 350 motor. I know the 700r4 transmission needs rebuilding. I do a lot of towing with this suburban and am deciding whether to rebuild the 700r4 trans, or put in a 350 trans with a 9 inch tailshaft.

I am letting the majority decide for me on which one to go with.

Thanks for the help
Tommy Davis

Tom · 08-07-2004, 08:21 PM

Why would you want to loose overdrive? I don't get it.....

junkyardpartseeker · 08-07-2004, 10:06 PM

Not wanting to loose the overdrive, just wanting to know which one would be better on the heavy towing it will be going thru. I am not too familiar with them, so I thought I would let the ppl here decide for me.

Thanks for the help.
Looks like I will try to get the 700r4 rebuild. I know it is a 85. Is there other years I should look at that would be better?

I am not running any emissions and am not sure what all I would need to install it after rebuild.

Tommy

RockHQ · 08-07-2004, 10:14 PM

If possible get a 1988-1992 year 700R4 from a K-truck (4wd) and have it rebuilt.

Destructo · 08-08-2004, 12:04 AM

You can update your 85 transmission with later parts. But I would just add extra clutches in the 3rd-4th gear, add corvette servo, .500" boost valve, shift kit setup for towing, good transmission cooler and a lockup kit so you can lockup the torque converter in 3rd gear. You could also just get a later model valve body too I think, thats the only real difference bewteen the early and later model transmissions, I don't remember if the valve bodies interchange though. You could also upgrade to a heavier sprag but for our year 700r4 its kind of expensive because the whole thing needs to be replaced, also the sun gear shell can be replaced with a stronger unit.

How much weight are we talking about here?

junkyardpartseeker · 08-08-2004, 10:00 AM

Not sure on exact weight. I do know my wife has a 26ft trailer loaded with her flea mkt items. Just want to be prepared if she gets more in there.

Tommy

Tom · 08-08-2004, 08:07 PM

Do get a newer style 700R4, don't bother updating yours. It should be cheaper to just buy a core newer model and rebuild it instead of updating the old one.

SanitysBane · 08-08-2004, 08:10 PM

a 700R4 is suposedly a turbo350 with an overdrive, i would go 700R4 all the way, i've got one in my truck and i love it. just gotta build them right if you want them to last

*1972C10* · 08-09-2004, 12:46 AM

I belive if i was wanting a heavier duty for towing id put in a th375 or th400

gchemist · 08-09-2004, 01:56 AM

Rebuild any core from 85 and up. I have an 85 and beat it pretty good. No problems with a stout rebuild.

View Poll Results: transmission type
700r4 transmission	19	70.37%
350 transmission	8	29.63%
Voters: 27. You may not vote on this poll

08-07-2004, 03:44 PM	#1
junkyardpartseeker Registered User Join Date: Mar 2003 Location: Mabelvale, AR Posts: 695	transmission type poll As most of you know, I have a 84 suburban with a 350 motor. I know the 700r4 transmission needs rebuilding. I do a lot of towing with this suburban and am deciding whether to rebuild the 700r4 trans, or put in a 350 trans with a 9 inch tailshaft. I am letting the majority decide for me on which one to go with. Thanks for the help Tommy Davis __________________ junkyardpartseeker@sbcglobal.net

08-07-2004, 08:21 PM	#2
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	Why would you want to loose overdrive? I don't get it..... __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

08-07-2004, 10:06 PM	#3
junkyardpartseeker Registered User Join Date: Mar 2003 Location: Mabelvale, AR Posts: 695	Not wanting to loose the overdrive, just wanting to know which one would be better on the heavy towing it will be going thru. I am not too familiar with them, so I thought I would let the ppl here decide for me. Thanks for the help. Looks like I will try to get the 700r4 rebuild. I know it is a 85. Is there other years I should look at that would be better? I am not running any emissions and am not sure what all I would need to install it after rebuild. Tommy __________________ junkyardpartseeker@sbcglobal.net

08-07-2004, 10:14 PM	#4
RockHQ ROCKET POWER! Join Date: Feb 2003 Location: Finland, Europe Posts: 509	If possible get a 1988-1992 year 700R4 from a K-truck (4wd) and have it rebuilt. __________________ What did i do last nite? I had a wonderful time, That's what they tell me What did i do last nite? 1979 C-10 shortfleet: Olds 350, Th400, 12 bolt Current project: 1969 Olds 455 W-30, needing a rebuild

08-08-2004, 12:04 AM	#5
Destructo Registered User Join Date: Sep 2003 Location: Lewisville, NC Posts: 1,836	You can update your 85 transmission with later parts. But I would just add extra clutches in the 3rd-4th gear, add corvette servo, .500" boost valve, shift kit setup for towing, good transmission cooler and a lockup kit so you can lockup the torque converter in 3rd gear. You could also just get a later model valve body too I think, thats the only real difference bewteen the early and later model transmissions, I don't remember if the valve bodies interchange though. You could also upgrade to a heavier sprag but for our year 700r4 its kind of expensive because the whole thing needs to be replaced, also the sun gear shell can be replaced with a stronger unit. How much weight are we talking about here? __________________ 1985 Scottsdale Shortbed 4x4 Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch. 2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.

08-08-2004, 10:00 AM	#6
junkyardpartseeker Registered User Join Date: Mar 2003 Location: Mabelvale, AR Posts: 695	Not sure on exact weight. I do know my wife has a 26ft trailer loaded with her flea mkt items. Just want to be prepared if she gets more in there. Tommy __________________ junkyardpartseeker@sbcglobal.net

08-08-2004, 08:07 PM	#7
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	Do get a newer style 700R4, don't bother updating yours. It should be cheaper to just buy a core newer model and rebuild it instead of updating the old one.

08-08-2004, 08:10 PM	#8
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	a 700R4 is suposedly a turbo350 with an overdrive, i would go 700R4 all the way, i've got one in my truck and i love it. just gotta build them right if you want them to last __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

08-09-2004, 12:46 AM	#9
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	I belive if i was wanting a heavier duty for towing id put in a th375 or th400

08-09-2004, 01:56 AM	#10
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Rebuild any core from 85 and up. I have an 85 and beat it pretty good. No problems with a stout rebuild. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

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