Gear Ratio Question..

[Mr70]

I think 1970 saw a new ratio allowance on certain engines,do to thier increasing Horsepower and possible warranty concerns too.
1969 Chevelle,Elcamino w/<span style="text-decoration: underline">L-35</span> 325HP engine,w/o Air Conditioning &amp; equipped w/3spd. &amp; 4spd. trans. could get the 3:73 posi or 4:10 posi for extra cost.Neither ratio was possible with a TH400 trans.
Only the 3:73 was possible for an extra cost,(No 4:10),on those when A/C equipped,but only when equipped with the 2.52:1 low 4spd.

Chevelles equipped w/<span style="text-decoration: underline">L-34</span> 350HP engine w/o A/C,and ANY transmission,could get the 3:73 posi or 4:10 posi for an additional cost.
Only the 3:73 was possible for an extra cost,(No 4:10),on those when A/C equipped.

<span style="text-decoration: underline">L-78</span> 375HP engine Chevelle &amp; Elco could get an extra cost 3:73 posi or 4:10 posi with the TH400 or when any M/T ratio was ordered.A/C was not possible on this engine.


I have a list for all the other 1969 vehicles,including Corvair,but didn't know if you wanted those or just the Chevelle.