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EA71 4-speed to EA81 5-speed swap
Posted 24 October 2012 - 11:29 PM
The half-shaft lengths are off because the new transmission is wider than the old transmission.
The 5-speed transmission seems shorter, so I'll have to get the drive shaft extended.
The shifter linkages don't line up. Neither do the transmission mounts.
The engine and bell housing don't fit on the cross member beneath them correctly.
HELP! Your time is appreciated. Thank you!!
Posted 25 October 2012 - 09:25 AM
Posted 25 October 2012 - 06:10 PM
The Car is a 1978 Subaru brat.
Posted 26 October 2012 - 12:57 AM
Posted 26 October 2012 - 01:12 AM
Posted 26 October 2012 - 03:21 AM
I think the biggest problem you will face is the CV joint assembly will interfere with the steering shaft/joint.
If you search there is info on the USMB about what is required to modify EA81 (which are the same as EA71) gearbox mounts to fit the 5 speed. Some people cut the 'ears' of the mounts and weld on a new piece which is then bolted to the transmission, others elongate the holes in the mounts and the transmission crossmember to make it all fit. Some (GD?) have even made the EA82 mounts fit with lots of modification (they are a better design). There is also a USMB member called Jerry (IIRC) who makes a kit for fitting the 5 speed in the EA81 engined cars.
Note your Brat originally had the EA71, I doubt Jerry's kit will work and there are some clearance issues, the previously mentioned steering problem is the one most come across and I am not sure if the width of the 5 speed creates issues in the transmission tunnel, especially if your Brat is not lifted.
I should point out I have not done this conversion myself, although I keep thinking about trying it! The info I have kept in my head from reading through many posts on the subject over the years.
Basically while not impossible there would certainly be some fabrication needed to get the 5 speed to fit, not the least of which is;
- Custom mounts
- Lengthened drive shaft (or use the EA82 drive shaft by installing the centre bearing mount to your trans tunnel - this seems relatively easy!)
- Custom shifter linkages or the original 5 speed stuff by modifying the trans tunnel to make them fit
- Some mucking around with the steering shaft/linkages so it can clear the CV joint assembly
Edited by Leeroy, 26 October 2012 - 03:26 AM.
Posted 26 October 2012 - 01:50 PM
You'll need to swap out the bell housing, flywheel and clutch to the EA82 set up. You can also grind out a notch in the transmission or weld in an extension on the steering linkage to solve the clearance issues, you can ether have a one piece drive line built or use the ea82 drive line and just mount up the center carrier bearing (bolt or weld). Then possibly do a bit of cutting, grinding and welding on the transmission tunnel for the shift linkage and any clearance issues you might have. Then build your transmission mount. From my experience this is what I think you'll need to do. If I were you I'd just put in another 4-speed s/r transmission unless you have the time and money to do this conversion.
Posted 26 October 2012 - 11:51 PM
The EA71 (not mine) http://allenginelist...u-engine-specs/
The EA81 (Identical not mine) http://2.bp.blogspot...subi engine.jpg
The 5-Speed Duel-Range transmission http://img229.images...93/p7011028.jpg
I cannot Find a pic of my 4-speed 4x4 transmission.
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