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Gettin By on Gettin By
Join Date: Jan 2008
Location: Cedar Creek, Tx
Posts: 1,033
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Rear end gear questions for my old white 69...
Well.. my 69 is back on the road after a year. rebuilt the 72 buick 455 with a t400 that was in it. But hitting the road it was running 70 at around 3500 rpm. My rear end is the 3.73. The motor setup came out of a 72 Buick electra that had 2.53 gears in it. I've always thought about a 3.08 posi in it to drop the rmps and get that power planted to ground and boost the current 18mpg to around 20+, but it seems the mpg will still suffer with the 3000 rpm on the drive into work.
Is a gear set up higher then a 3.08 even avalible for this rear end? Anyone think i would loose that much giddy up by dropping to something higher geared then a 3.08? I'm figuring about 380hp and 400 tourqe currently on the 455 with all the emission stuff striped off, headers into 3 1/4 pipe with some flowmaster knock offs dumped just before the back tires. The truck will burn both tires to the rims if i let it, but doesn't want to go more then 90mps. Just venting a thought and looking for some advise. ttt
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69 CST10 LWB 455 Buick 00 S10 2.2 Vin5 76 GL1000 Naked 1bl VW carb "Adios to all the concrete; Gonna get me some dirt road back streets" |
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