Hello

[m42b32]

Awesome projects!

[KaiserRolls]

Welcome to here!

[YoungCR]

What mods are needed for the e28 rear subframe?

[Earl]

YoungCR said:

What mods are needed for the e28 rear subframe?

" Place the e21 and e28 subframe next to each other side by side, front - rear, whatever. You need to find the midpoint of both subframes and scribe a line there. Once you have found the distance of the e21 subframe from midpoint to the mounting bracket for the subframe bushing you transfer this measurement to the e28 subframe and cut the subframe here. Remove the subframe bushing mounting "ears" from the e21 subframe and weld them on to your new shorter e28 subframe and be sure you remember which flange goes to which side. Mount the e21 shock/springs and the e21 subframe bushings to the e28 subframe and test fit the subframe on the e21. If everything fits you then need to bolt the diff into the carrier and locate where the diff mount will be placed. "

[retoropak]

E21 vs. e28

Jig the e21 subframe locking the centers of the mounts and centers of the output and input flanges. Alternatively measure the crap out of it.

Chop.

Measure.

Tack weld. Test fit. Make corrections and weld.

Also, you will. Need to relocate the diff mount bracket and center bearing and shorten the driveshaft.

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[B C]

@Bassboy3313 spliced an E30 rear diff carrier into his E21 rear subframe to handle the extra power. I'm sure this thread would interest him.

[retoropak]

Note that with e28 subframe you will have 25mm wider track per side. So your standard e21 offset ( et13) might be a bit too much.

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[Bassboy3313]

I have been following your thread on BF too. Welcome to here!!!

[Jdesign]

Welcome!! It looks like you have quite the fun projects there!

[The Full Banana]

Hey Wojtek! Good to see you on here.