89 suburban tranny trouble - The 1947 - Present Chevrolet & GMC Truck Message Board Network

luvlife · 08-10-2004, 03:13 PM

Well i read all the feedback on the 88 i am having a different problem i have reverse, no od it is a 700r4 do u think its fried or should i try these other things first and if it is no good could it interchange with a 350 turbo or a 400? I have only had it about 10 months and it doesnt want 2 tow anything its geared really high to save gas?? dunno really

This is my toy he has a 72 jimmy i love this forum it has helped with both toys

Thanks for your time!!!!!!!!!!!!

Grim Reaper · 08-12-2004, 10:56 AM

Problems like this are comon to all trucks. You would probably get faster replies in the regular 73-87 Forum.

Yes it sounds like it's toast and needs a rebuild.

Gear ratio will put a lot of load on the transmssion. What size tires are on it and do you know the gear ratio? Most will tell you that if you have 33 inch tires and a 700R4 you need to be geared atleast 4.10 and might be better with 4.56 if you tow.

TH350 and TH400 will bolt in but you need to also get a Driveshaft that matches. The transmissions are different lengths so it has to be accounted for.

Templarum · 08-16-2004, 01:50 AM

I just had to replace the trans (700r4) in my 89 for symptoms much like yours. The internal bearing in the planetary came apart and spit metal all throughout the works. No easy fix for your kind of problem.

David

Supergas · 08-16-2004, 07:35 PM

Buy a new TCI or Hughes 700R4 with all the good internals for around $1500 & all your troubles will be over.....

08-10-2004, 03:13 PM	#1
luvlife Registered User Join Date: Aug 2004 Posts: 3	89 suburban tranny trouble Well i read all the feedback on the 88 i am having a different problem i have reverse, no od it is a 700r4 do u think its fried or should i try these other things first and if it is no good could it interchange with a 350 turbo or a 400? I have only had it about 10 months and it doesnt want 2 tow anything its geared really high to save gas?? dunno really This is my toy he has a 72 jimmy i love this forum it has helped with both toys Thanks for your time!!!!!!!!!!!!

08-12-2004, 10:56 AM	#2
Grim Reaper Registered User Join Date: Jul 2001 Location: Atlanta GA Posts: 1,704	Problems like this are comon to all trucks. You would probably get faster replies in the regular 73-87 Forum. Yes it sounds like it's toast and needs a rebuild. Gear ratio will put a lot of load on the transmssion. What size tires are on it and do you know the gear ratio? Most will tell you that if you have 33 inch tires and a 700R4 you need to be geared atleast 4.10 and might be better with 4.56 if you tow. TH350 and TH400 will bolt in but you need to also get a Driveshaft that matches. The transmissions are different lengths so it has to be accounted for. __________________ Grim-Reaper 70 Pontiac LeMans Sport Convertible, worlds longest resto in progress Looking for 71-72 2wd Blazer or Jimmy Project

08-16-2004, 07:35 PM	#4
Supergas Registered User Join Date: Sep 2003 Location: Victoria,Texas Posts: 49	Buy a new TCI or Hughes 700R4 with all the good internals for around $1500 & all your troubles will be over..... __________________ Gene 2021 Chevy Silverado CC Custom (DD) 2018 Tahoe LS 1964 Oldsmobile F85 Post

08-16-2004, 01:50 AM	#3
Templarum Registered User Join Date: Feb 2004 Posts: 5	I just had to replace the trans (700r4) in my 89 for symptoms much like yours. The internal bearing in the planetary came apart and spit metal all throughout the works. No easy fix for your kind of problem. David



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