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Joined: Jan 2007
Posts: 43
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jan 2007
Posts: 43 |
I RECENTLY PICKED UP TWO OVERDRIVE TRANNIES. ONE IS #3866882 WHICH IS GM WITH TOTAL LENGTH OF TWENTY AND A HALF INCHES LONG.THE OTHER IS GM #3849534 WITH A TOTAL LENGTH OF TWENTY ONE AND A HALF INCHES LONG.THIS TRANNY HAS A DATE ON THE TAIL OF 11/23/64. I WOULD LIKE TO KNOW WHICH TRANNY TO PUT IN A 1968 CHEVY PICKUP WITH A 327 ENGINE. ALSO WOULD LOW GEAR BE SINKRONIZED IN EITHER TRANNY. THANKS
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The 1965 was the last year of the non-syncronized first gear.
The 3849534 would be a 1965 transmission.
I do not have the casting number for a 1966 but if the case with the 3866882 looks like the other case its non-syncronized. The new for 1966 syncro. case will look very different.
1967 is the last year that overdrive was offered and the 1966-67's would be very rare.
I would rather have the non-syncro with O.D. than the new syncro. with no O.D.
Gene Schneider
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Joined: Jan 2007
Posts: 43
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jan 2007
Posts: 43 |
IT'S POSSIBLE THE TRANNY NUMBER COULD BE 6866882. ALSO THE SIDE COVER HAS SEVEN BOLTS ON THIS TRANNY. THE OTHER TRANNY #3849534 HAS ONLY FOUR BOLTS ON THE SIDE COVER. THANKS DENNY
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Joined: Jan 2007
Posts: 43
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Jan 2007
Posts: 43 |
What was the first overdrive tranny used in and how many years were they used? Thanks Denny
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The first year OD was available in a Chevrolet (from the factory) was 1955. Some cars had it available back in 1934 (Studebaker, Chrysler and DeSoto)...but GM was hesitant to pay Warner for using it. Would have been a great asset for GM cars. Chevrolet is the only GM make that finally got it.
The all syncro trans. should have the number 3919365 stamped into the cover.
Gene Schneider
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