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i called gear vendors a while back and the tech told me they dont make an o/d unit for manuals, i swear ive seen it done. anyone running one.
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<font color="blue">Here are the specs right from Gearvendors. </font>
M21 4-SPEED Close Ratio - showing clutchless options
Axle Ratio
*****4.88 4.56 4.10 3.73 3.55 3.42
*****Trans Ratio Final Drive Ratio
1st 2.20 10.74 10.03 9.02 8.21 7.81 7.52
Over 1.71 8.35 7.81 7.02 6.38 6.08 5.85
2nd 1.64 8.01 7.48 6.72 6.12 5.82 5.61
Over 1.28 6.23 5.82 5.23 4.76 4.53 4.36
3rd 1.28 6.25 5.84 5.25 4.77 4.54 4.38
Over 0.99 4.86 4.54 4.08 3.71 3.54 3.41
4th 1.00 4.88 4.56 4.11 3.73 3.55 3.42
Over 0.78 3.79 3.55 3.19 2.91 2.77 2.66
<font color="blue">... So you get a 5th gear overdrive and at least one clutchless shift to be used at any moment
(we ship the kit with our 6speed car badges) and a huge performance gain plus
get to retain your period correct transmission in the car and get the worlds strongest overdrive trans.
Since your Muncie or BorgWarner is stronger than any non-race 5 or 6 speed,
the Gear Vendors is just he right way to get overdrive in your GM manual performance car.</font>
www.gearvendors.com/hrgm4sm.html
www.gearvendors.com/prices.html