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Old 12-08-2016, 01:20 PM   #1
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90 chevy 6.0L / Trans

I have a 90 model with the 6.0 and auto trans. Can someone tell me what type of transmission would have likely came in this? I believe it is a 3 speed. It is shifting hard and is missing the dipstick, would like to get some parts and filter for it, etc.....Thanks for the help!!

James
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Old 12-08-2016, 05:24 PM   #2
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GM didn't come out with the 6.0L until the 1998 model year in most applications.

In 1990 it would have been a 305 or 350 small block or a 454 big block. The transmission would have been the TH400 or perhaps the TH700R4/4L60.

If it really is a 6.0L it would be the 4L80E or the 6L80 or 6L90. If it is the 8.1L it would be the 4L85E or the 6L80/6L90 or the 8L90.
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Old 12-09-2016, 07:12 AM   #3
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Or did you mean to type 6.2?

If that's the case, it's also very likely a TH400.
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Old 12-09-2016, 08:31 AM   #4
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Originally Posted by cowlitzcoach View Post
GM didn't come out with the 6.0L until the 1998 model year in most applications.

In 1990 it would have been a 305 or 350 small block or a 454 big block. The transmission would have been the TH400 or perhaps the TH700R4/4L60.

If it really is a 6.0L it would be the 4L80E or the 6L80 or 6L90. If it is the 8.1L it would be the 4L85E or the 6L80/6L90 or the 8L90.
You forgot about at least one other big block............
It could be a 366 (6.0L) big block Chevy, used in school buses up to the mid 1990's.
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Old 12-09-2016, 09:10 AM   #5
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Yes, mine is the 6.0L / so all my paperwork is saying. May have to check the motor itself...not sure where to look though. / where on the trans itself would I look to get a better idea?
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Old 12-12-2016, 08:35 AM   #6
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check via pan shape/config/bolts

Transmission Identification Chart
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Old 12-12-2016, 12:58 PM   #7
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You forgot about at least one other big block............
It could be a 366 (6.0L) big block Chevy, used in school buses up to the mid 1990's.
You are correct in the medium duty chassis. But in the P-30 and G-3500/4500 chassis the only big block available was the 454 car and light truck engine. The big block Tonawanda truck engine never made it into the light duty chassis.
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Old 12-12-2016, 03:28 PM   #8
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Originally Posted by cowlitzcoach View Post
You are correct in the medium duty chassis. But in the P-30 and G-3500/4500 chassis the only big block available was the 454 car and light truck engine. The big block Tonawanda truck engine never made it into the light duty chassis.
I could not tell by his post what Chevy type bus.
Assumed:
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Old 12-12-2016, 03:48 PM   #9
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that is like mine.
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Old 01-03-2017, 05:59 PM   #10
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I have a 1974 chevrolet bluebird c60. The engine in it is a 350ci 5.7L. The transmission is a Alison at545. If your bus has a 6.0L 366ci. The transmission is most likely an Alison transmission.

Sent from my SM-G530W using Tapatalk

The Chevrolet medium duty Kodiak truck used the same drive train. Your bus looks to be using gen 1 flip front hood. Hope this helps. Gordon
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