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07-16-2021, 11:41 PM | #1 | |
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Z4M vs 3.0si vs 3.0i transmission difference
Found another transmission to replace my blown unit, looking for info as I'm too lazy to pull the transmission back out.
I have been on a 3.0i 2003 Z4 M54 trans GS6-37BZ-THEA which has the locator pin right where the starter motor location exists. I found a 2007 3.0si N52 trans GS6-37BZ-TJES. It bolts right up, but some bolt holes don't line up, while others do on my Collins plate. The odd thing is it went in like butter, perhaps too easy. I haven't driven it yet, but it seems to catch the clutch if I put in gear, so it must be reaching the clutch disk splines. My concern is that the input shaft may be a different length. I didn't check because I'm lazy, thought these were all the same. Here is what I found on bimmerforums: Quote:
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07-17-2021, 10:19 AM | #2 |
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Bah.. I caved in and decided to pull it back out and measure. Takes only 45 minutes to remove the tranny on this car, not too bad.
GS6-37BZ-THEA (M54) from 3.0i 2003 - end of input shaft to end of bellhousing: 1 1/16" - start of splines to end of bellhousing: 2 3/32" - pilot bearing OD 15mm GS6-37BZ-TJES (N52) from 3.0si 2007 - same thing as above - two of my lower mounting bolt holes don't line up with the Collins plate, I have to drill them out on the bellhousing. Easy to do. - missing a locating pin on the bellhousing (not machined in there). I can make do without it, Collins plate has two locator bushings that still recess into the bellhousing. GS6-37BZ-TJEE (S54) from Z4M - end of input shaft to end of bellhousing: ~3/16" (5mm) - start of splines to end of bellhousing: ~ 1 3/8" (35mm) - pilot bearing OD 15mm (Courtesy of Michael9218) GS6-37BZ-TJEP (N52) 330i E90 - no idea... GS6-37BZ-THEG (M54) 520i - no idea... There. Now the internets has actual data.
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Andre - 2J into a Z4 Coupe!
Last edited by dre99gsx; 09-06-2021 at 02:26 PM.. |
09-06-2021, 02:25 PM | #3 |
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I added the dimensions for the Z4M (S54) transmission. Thanks to Michael9218 - it's now obvious they are CAN NOT be swapped between 3.0i/3.0si due to the input shaft being longer.
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Andre - 2J into a Z4 Coupe!
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09-06-2021, 05:41 PM | #4 |
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Can the input shafts be swapped? Are they the same bearing dimensions and shaft diameter spline size?
Tough question, but wondering if you know.
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Current : 2007 Z4MC, 2010 F650gs, 2018 340i M Performance Edition, 2020 G310gs, 2009 128i
Past : 2001 325 cab, 2002 325xit, 1992 325 M tech ll appearance pack cab, 1990 325is, 1988 M3, 2012 328xit, 2009 M135i cab, 2016 M235i cab, |
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09-07-2021, 05:47 PM | #5 |
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ZF 5 speed
Since we're posting transmission differences, I thought I would share what I know about the differences of the Z4M and ZF 5 speed transmissions for those with a track car that would like to install the lighter 5 speed behind their S54.
These transmissions share the same M5x bellhousing interface. The input shaft has the same dimensions with the exception of the clutch splines. The Z4M has a finer 22 splines while the ZF 5 speed has 10. So to install the 5 speed you simply use an E36 M3 clutch. The ZF 5 speed is also 100mm shorter, so driveshaft and gear selector rod need to be lengthen. The transmission cross member can be sourced from earlier 5 speed Z4 non-M roadster. Bolts right up with no modification. As for why you would want to do this, 20 lbs and the ZF 5 speed is said to be stronger (and cheap & readily available). Even with 4.10 diff gearing, you don't need 6th gear on track. They both have a 1:1 5th gear. |
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