Brandon,,
''78-'79 Midgets definately came with 3.7's. most find that a 3.7 is a bit
much with the Datsun 5 speed. It would be great on the highway, but low end
performance is not so great and a 3.9 is a better combo. Depends on what
you want. I have a 3.9 with my Datsun 5 speed on 175-70 tires and at 65MPH
I am at about 3100-3200RPM in 5th gear which feels about right to me. I
think you might feel that the RPMs with a 3.7 would be too low to get much
acceleration even at speed and any grades would probably require
downshifting to at least 4th anyway.
BTW, if you want to check diff ratio, there are two numbers stamped on the
top of the diff on a boss near the mounting flange. A 3.9 is marked 10/39,
a 3.7 is marked 11/41, and a 4.22 is marked 9/38.
Gerard
Gerard
At 4:01 AM -0500 4/2/02, BWesterley@aol.com wrote:
>I have the opportunity of buying two 79 rubber bumper midget parts cars.I
>gather that this car has the 3.7.1 rear end in it.Question is how do I tell
>if indeed I am getting a 3.7.1 rear end? I know what Haynes says but I need
>reliable info from those in the know before I sink money into this one. Both
>are completely unmolested except for rust on one and both were bought as
>project cars years ago by someone who has now lost interest.
>
>I am sort of planning my next project and am thinking of modified 1275 Datsun
>5 speed and a 3.7.1 rear end.I know that the 1275 and Datsun 5 speed are a
>good combination but will using a 3.7.1 rear end enhance this combination any?
>
>If I find that these have the 3.7.1 rear ends I shall buy them remove them
>and the rest of the 2 cars are free to anyone on the list that feels like
>coming with a trailer to pick them up.Both engines ran when parked one trans
>is supposed to be good the other has a problem with reverse.One car is full
>of rust the other is clean as a whistle.One interior is good one is shot.
>
>Both cars are in Oceanside California.The rust bucket can be cut up after it
>is stripped for parts to save trailer space.It is way too gone for restoring.
>
>Thanks in advance for any advice it is very much appreciated. Brandon.
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