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245L - Brake booster + diff 200 1975

posted by  CeeBee1 on  Tue Aug 24 18:35 CST 2021
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last visit: Wed Oct 16 20:06 CST 2013
[RELATED]

adding to Dave's info on rear end swap.

" Early 240's with the B21 have a 3.9 ratio and later 240's (with auto trans) a 3.73."

My 80 B21 with M45 4spd. US model with the RED 55 mph on the speedometer, which maxes on the dial at 85MPH.

When the US National 55mph speed limit was dropped, and as highway posted speeds went to 65-70, I started looking for a 5spd. The driving I95 just keeping up with the 70mph traffic...
I still have the car, but rarely take it on the interstate, excepting short trips.

So, when swaping out the rear on your 75, look for at least 3.73 rear from an auto trans donor, as a swap to a 3.9 will make no difference at highway crusing speeds, esp with the louder pushrod B20 engine

Good luck





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