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#1 |
Registered User
Join Date: May 2018
Location: Prattville, AL
Posts: 598
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Help identifying my transmission
This one has me stumped big time.
The transmission that came in my '67 appears to be a TH350. HOWEVER, it has only two speeds. The trans pan has the angled corner notch and 13 bolts indicating that it's a TH350 which is a three speed. Thought maybe it a TH250 but that's also a three speed from what I found. I may at a loss as to what it is. Any help in identifying it would be greatly appreciated.
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-------------------------------------------------------- 1967 C10 "Snowball" (Currently in a thousand pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" |
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#2 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,607
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Re: Help identifying my transmission
Defective TH350 that fails to engage one of its three gear ratios?
Is there a transmission listed on the SPID?
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#3 |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,060
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Re: Help identifying my transmission
Powerglide- 2 speed auto
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#4 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,049
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Re: Help identifying my transmission
Here's a link with info.
Sounds like there issue with the transmission not shifting. Link: https://www.chevyhardcore.com/tech-s...uminum%20units
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#5 |
Registered User
Join Date: May 2018
Location: Prattville, AL
Posts: 598
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Re: Help identifying my transmission
I went under the truck and shifted it manual and it is indeed a two speed. I went back underneath it looking for any markings on the transmission case. The only thing I found was 8T. There was no M33, M38 or M39 on it. Snapped a couple pictures hoping that would help.
Also, the guy I bought the truck from just had the transmission rebuilt.
__________________
-------------------------------------------------------- 1967 C10 "Snowball" (Currently in a thousand pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" |
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#6 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,607
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Re: Help identifying my transmission
I was not aware that a Powerglide was still used in some of these trucks. Does a Powerglide have the angled corner on the pan? Seems like I learn a bit more almost every day -- or learn how much I don't know.
Peanut, if you can talk with the shop that rebuilt the trans, they should be able to fill you in on all the details.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#7 |
Senior Member
![]() Join Date: Dec 2009
Location: TN.
Posts: 8,049
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Re: Help identifying my transmission
Maybe the guy that rebuilt it done a custom job.?
How long is that tailshaft? That appears to be the T350 case. There was a long and short tail shaft on the T350. There was also a 12" tail shaft on some T350 cars. The aluminum case powerglide had 14 bolts in the pan. The Early Powerglide was Cast iron and IIRC it did not have a pan.
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#8 |
Registered User
Join Date: Mar 2019
Location: San Ramon, CA
Posts: 223
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Re: Help identifying my transmission
Look at the pans, they are different.
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#9 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,358
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Re: Help identifying my transmission
Sure looks like a 350 pan. How many notches in the detents of the shift selector? Six (PRND2L) would mean a three forward speeds (THM) and five (PRNDL) would mean two forward speeds (PG).
In the two gears, how fast do you go at what RPM? As an afterthought, does it shift on time? If the vacuum modulator is weak it can shift way late or not at all, and you might not be getting high gear.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#10 |
Registered User
Join Date: May 2018
Location: Prattville, AL
Posts: 598
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Re: Help identifying my transmission
The tail shaft is 9"-9.5" which falls in line with a TH350. I have disconnected the shift linkage and have five stops (P, R, N, D, L). The truck last time I drove around the house never shifted into drive. It just stayed in low.
__________________
-------------------------------------------------------- 1967 C10 "Snowball" (Currently in a thousand pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" |
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