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#1 |
Registered User
Join Date: May 2018
Location: Prattville, AL
Posts: 611
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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: 13,650
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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: 16,148
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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: 8,178
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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: 611
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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.
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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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#6 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,650
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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: 8,178
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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: 227
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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: 10,451
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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: 611
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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.
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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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#11 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,270
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Re: Help identifying my transmission
All the Glides I used to have [drag racing application] had fins on the case [or ribs maybe] the went from the sides across the top. this does not look like any power glide I ever saw. Jim
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#12 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,641
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Re: Help identifying my transmission
Turbo 350 had the vacuum modulator on the passenger side at the back like in the pic.
Powerglide had the modulator on the drivers side at the back. You got a t-350 |
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#13 |
Senior Member
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Location: San Ramon,CA
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Re: Help identifying my transmission
I've heard of dirt track racers building 2 speed TH350's, but that seems really far-fetched for a truck tranny
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1970 C10 Custom longbed 350/350 |
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#14 |
Registered User
Join Date: May 2018
Location: Prattville, AL
Posts: 611
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Re: Help identifying my transmission
Well I crawled under the truck with phone in hand and confirmed it is indeed a TH350 like everyone thought. That only leaves the question of why do I have only 2 speeds instead of 3.
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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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#15 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,650
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Re: Help identifying my transmission
That's progress. Have you been able to determine which two gears you have, and which gear is missing?
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#16 |
Senior Member
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Location: TN.
Posts: 8,178
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Re: Help identifying my transmission
This is what makes me think it is Customized.
The arrows pointing to the Tailstock / Silicone. And the electrical Plug. ?
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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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#17 |
Registered User
Join Date: May 2018
Location: Prattville, AL
Posts: 611
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Re: Help identifying my transmission
Getter-Done the electrical connection is for the digital speedometer. The transmission was rebuilt just before I bought it. So that would explain the silicon on the tailshaft.
If anyone has a TH350 laying around could you manually shift it and tell me how many stops it has.
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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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#18 | |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,731
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Re: Help identifying my transmission
Quote:
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#19 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Help identifying my transmission
In post #10 you said "The truck last time I drove around the house never shifted into drive. It just stayed in low."
I think you need to get it out on the road to do a proper test drive. If it still won't shift out of low, I would check the governor. They get stuck. I've seen it happen a lot. Very easy fix but don't take it to AAMCO , just do it yourself in a few minutes. -BA
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#20 | |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,148
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Re: Help identifying my transmission
Quote:
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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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#21 |
Registered User
Join Date: Oct 2014
Location: somewhere . . .
Posts: 966
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Re: Help identifying my transmission
looks like a turbo 350 w a long tail shaft
only other way to make sure , is to count bolt(s) on the trans pan and the shape of it
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dont want to hear excuses, i want to hear solution(s) |
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#22 |
Registered User
Join Date: May 2018
Location: Prattville, AL
Posts: 611
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Re: Help identifying my transmission
Son inlaw got a K5 Blazer with a TH350. He sent me a picture of the column shifter indicator and it matches what I have. So tomorrow I will go over and see how many stops/detents his has. I will probably make a pattern of all the shift locations to compare to mine.
__________________
-------------------------------------------------------- 1967 C10 "Snowball" (Currently in a thousand pieces down from a bazillion) 1989 Toyota DLX pickup "The Hulk" |
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#23 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,451
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Re: Help identifying my transmission
As mentioned above there are six notches for a 3 forward speeds transmission.
Park Reverse Neutral Drive Second First
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#24 |
Moderator
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Location: Southern Cal
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Re: Help identifying my transmission
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#25 |
Senior Member
![]() Join Date: Feb 2022
Location: Ca
Posts: 520
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Re: Help identifying my transmission
Only 5 detent positions seems odd. You are counting with linkage disconnected. Assuming you have six, have you verified vacuum at the modulator? A damaged or disconnected vac line will disable 3rd gear shift on my truck. Also a poorly set kickdown cable could be locking out 3rd. If you only have 5 shift positions you have something amiss internally.
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