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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2008 Posts: 49 Wrench Fetcher | | Wrench Fetcher Joined: May 2008 Posts: 49 | The transmission in my 55 2nd series has been changed to a later model. The trans has the following numbers cast into the side:
GM23
8825647
F82
The following number is stamped on a machined spot above these on the right side of the transmission:
12w419838
Can anyone tell me from these numbers what transmission this is?
Since it is not the original transmission, is it the same or a different length as the stock? Length measures 21.5 inches from front to back. How will this effect a change to a T5? Will the T5 still be longer than 21.5? I am trying to figure out if I will need a shorter driveshaft.
Thanks,
Hugh
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