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Ecklers AutoMotive
Username Post: What to look for in a TH350?        (Topic#357475)
AmericanPie 
Senior Member
Posts: 507

Loc: Camarillo, CA
Reg: 07-28-01
08-01-19 01:13 AM - Post#2772147    

From what I've been reading there were several different TH350s made, in slightly different lengths. A buddy says he has one for sale, and that it's from a late 60s Impala. What do I look for in searching for a correct TH350 that is a bolt-in swap for our cars? And what would be a fair price to pay for a good used one?



1965 Impala SS 327, Crocus Yellow


Edited by AmericanPie on 08-01-19 01:14 AM. Reason for edit: No reason given.

 
Ecklers AutoMotive
wagonman100 
Super Senior Member
Posts: 14280
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
08-02-19 03:19 PM - Post#2772261    
    In response to AmericanPie

I don’t know which would be considered a bolt in for your car. It probably depends on which trans you had originally as to whether the mount will line up or you are able to reuse your driveshaft (the front yoke has to match the output shaft splines and the length has to be correct). As far as I know there are only long and short tail TH350 transmissions for Chevrolet. The other TH350 is the Buick-Olds-Pontiac (BOP) trans that has a different bolt pattern on the case where it mates to the engine block. I don’t know if the short and long tail transmissions have different mount locations. You can probably search your swap online and it may give you the dimensions of each trans.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
bigbowtielover 
Valued Contributor
Posts: 2540
bigbowtielover
Loc: Surrey British Columbia
Reg: 09-01-13
08-02-19 05:18 PM - Post#2772269    
    In response to AmericanPie

You need one with a 6" tail. It will be a bolt in. Same driveshaft as powerglide. Same mounting etc. The 6" tail is common in cars. '69-'70 impala used this type. Also chevelle '69-'72 and Camaro '69-'81 and a few others. Tail shaft length was longer in other applications and was available in 6,9,and 12" lengths. Trucks and vans and some later '71-up impalas used the 9" length. 12" was used in '71-'76 wagons.



 
AmericanPie 
Senior Member
Posts: 507

Loc: Camarillo, CA
Reg: 07-28-01
08-07-19 12:05 AM - Post#2772598    
    In response to bigbowtielover

OK, thank you for that info. I'll check my friend's tranny to see which one he has. If it's the right one (6" tail section) it might be a good candidate since I at least know some of its history....although I'd probably have it rebuilt and upgraded internally before installing it anyway.

What do you think would be a fair price assuming it's in serviceable condition? It's been sitting under his workbench for at least 20 years.

Edit: Looks like the typical core charge for TH350s at transmission rebuilders is about $200-$250 so I'll assume a little more than that, maybe $300-$400 is a fair price for a good used one.

1965 Impala SS 327, Crocus Yellow


Edited by AmericanPie on 08-09-19 07:25 PM. Reason for edit: No reason given.

 
bigbowtielover 
Valued Contributor
Posts: 2540
bigbowtielover
Loc: Surrey British Columbia
Reg: 09-01-13
08-11-19 02:59 PM - Post#2772977    
    In response to AmericanPie

Sitting for 20 years I would call it a core. 250-350 is what I have seen them go for in my area for stock ones that were just pulled from running cars.



 
65acadian 
Member
Posts: 185
65acadian
Loc: Manitoba, Canada
Reg: 08-15-04
08-11-19 08:05 PM - Post#2772996    
    In response to bigbowtielover

One thing you will have to do is fabricate linkage to pull the TV cable out the correct amount at the carb. You can't run a TH350 without that cable being hooked up. Well you can, but you'll fry it in short order.



 
65_Impala 
Very Senior Member
Posts: 4232

Reg: 12-29-02
08-11-19 09:16 PM - Post#2772998    
    In response to 65acadian

  • 65acadian Said:
One thing you will have to do is fabricate linkage to pull the TV cable out the correct amount at the carb. You can't run a TH350 without that cable being hooked up. Well you can, but you'll fry it in short order.



The TH350 has a kick down cable, not a TV cable. It uses the governor and the vacuum modulator to control the line pressure and shift points, not the cable. The cables only function is to kick down the transmission at or near full throttle. You just lose downshifts if you don't connect it.



 
65acadian 
Member
Posts: 185
65acadian
Loc: Manitoba, Canada
Reg: 08-15-04
08-12-19 05:21 PM - Post#2773076    
    In response to 65_Impala

Ok, I stand corrected. I'm sorry for the misinformation. I recall in the 70's I installed one in place of a powerglide and it seemed to me the shifts had been mushy until I hooked it up. I guess the only thing mushy is my brain



 
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