I've been doing some calculations and was wondering if anyone's ever tried flipping over 3rd gear on the mainshaft to use it as 4th gear. The ratios would be perfect in this transmission i'm building.
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Some know me as the "Tranny Guy"
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No. Different size, teeth, etc. -
It won't on the countershaft
Some know me as the "Tranny Guy"Comment
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Plus if you flip it the spacing will be off, the teeth will not match up to the other gears and the sizing is all wrong...
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You're wrong.Originally posted by Raf99 View Post
mainshaft needle bearings are all the same part number. 3/4/5 are the same. So, same centerbore diameter.
From the accord 98-02 manual. pdf page 473
3rd gear thickness
standard 32.42 - 32.47 mm
And now from the 4g prelude vtec
4th gear thickness
vtec 4th 31.42 - 31.47
3rd gear is 1mm thicker than the 4th gear. so either turn 1mm off of the distance collar, or mill 1mm off the gear. -- That's for the mainshaft.
Countershaft is different. Different inner spline diameters of 3rd and 4th gear i think..... Confirmation pending.
See here for further info.
http://bensebuilt.livejournal.com/3125.htmlSome know me as the "Tranny Guy"Comment
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If you know the answers then fill your boots man. Looking like you are comparing a F23 to a prelude tranny (H22? H22A? LSD, non-LSD?) They may be close but a 1mm difference has major consequences for clearances.
Best of luck.Comment
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Are you saying you did it? If so how?Originally posted by Bense View Post
Unfortunately I think the naysayers are right. At our last race we destroyed our stock transmission. So we went searching for the closest, lowest gearing we could find. Time limited our search and we bought a used m2a4. While we were waiting for it to arrive I started scheming in my head. I had a plan of using the gear sets from each of the two transmission to make a close ratio box. I'd graphed it all out and it would have been epic. Top speed would have only been about 120 at about 6800rpm but for Lemons that's plenty, we would have been able to use 2,3,4, and 5 on several straights where we currently use 2 and 3, and maybe 4 for a few seconds. We could have kept it at the peak of the power band constantly. Three or 4 shifts on every straight.
But once we had them both open we saw how the spacers are built into the gears, so to put a tall 3rd in the 4th position would require machining off the spacers, and fabbing new ones to go on the other side of the gear. The photo above illustrates it perfectly.
It was a real disappointment. We thought we were gonna be able to hang with the e30s.
It could be done but the cost would be way more than a low final drive ratio.Last edited by ukemike; 07-15-2016, 09:23 PM.==========================
1991 Accord Lemons Race Car, "The Minnow" RIP
1993 Accord Lemons Race Car, "SpaceEx Starship"
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