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08-23-2023, 01:43 PM
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#1 |
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Registered User
Join Date: Jun 2013
Location: Palisade mn.
Posts: 76
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Tranny problem
I have a 1982 chevy k20 with a 6.2 diesel. Does this vehicle have an overdrive or 4th gear? It is shifting through 3 gears but in seems to be revving pretty high after 3rd gear and about 40 mph. I’m not sure what tranny is in it and the only number or letter I found on it was 7 or L. Any help with this would be greatly appreciated! It has 16 bolts on the transmission.
Last edited by Riley012; 08-23-2023 at 02:07 PM. |
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08-23-2023, 02:18 PM
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#2 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,611
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Re: Tranny problem
Very likely you have a TH400 so no overdrive. That is what my 84 CUCV(military K30) came with + the same 6.2 diesel. The cab has a stencil with limits of IIRC 50mph in 2WH and 30 in 4WL. 4.56 gear sets. It is not a speed demon.
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08-23-2023, 03:38 PM
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#3 |
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Registered User
Join Date: Jun 2013
Location: Palisade mn.
Posts: 76
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Re: Tranny problem
Unfortunately I don’t have a tach, but in just appears to revving much higher than it has in the past when I have had it on the highway. I’m worried that I will wreck something else.
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08-24-2023, 06:01 AM
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#4 |
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Registered User
Join Date: Sep 2002
Location: Liberty, Mississippi
Posts: 672
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Re: Tranny problem
16 bolts on the pan is likely a 700r4, as if I remember right, thm350 and thm400s only had 13 pan bolts.
A 700 has a square pan, a thm350 square with one corner cut off, and a 400 has a kidney shaped pan |
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08-25-2023, 05:44 PM
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#5 |
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Registered User
Join Date: Jan 2009
Location: Edgewood, WA
Posts: 108
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Re: Tranny problem
Here ya go:
__________________
I may be old, but I still enjoy the feeling of the earth rotating beneath my wheels... |
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08-26-2023, 01:13 PM
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#6 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,611
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Re: Tranny problem
Thanks for the pan pics and bolt counts. Concise and very useful.
To OP, if you have one of the early 700R4s, they had durability issues. Later ones had stronger internals. Not sure what year the improvements happened. If you have lost OD, best limit your highway driving. The 6.2 doesn't like high RPMs. |
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08-28-2023, 12:01 PM
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#7 |
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Registered User
Join Date: Jun 2013
Location: Palisade mn.
Posts: 76
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Re: Tranny problem
Mine is number 6.
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09-01-2023, 12:43 PM
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#8 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,727
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Re: Tranny problem
#6 is the 4 speed overdrive transmission. And ‘82 is an early one and most likely it has been gone through before. Reality is auto trans have to be rebuilt at some point.
__________________
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