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JasonBird

5 speed rebuild

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I have a E21 '82 316 gearbox (Getrag 240) that I wish to fit to my 02.

The car it came of had 136k on the clock so I was wondering whether it would be worth rebuilding especially as it is going to be a motorsport application?

5th gear is overdrive,

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So it's an unknown unit? Tough to say without driving it, maintenance and usage by the previous owner are certainly factors as to whether it needs synchros and/or bearings. (I imagine you'd not want discover a bad synchro in a quick, hard shift on race day!)

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Well then whats involved in re building one?

Is there a dealer to source the parts from?

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Blunt (found here on the FAQ) is a great source for parts.

As for the rebuild, my understanding is that while the 4-speed is a reasonable project for the do-it-yourselfer, the 5 speed OD is a greater challenge (other folks out there may confirm or deny this). You might check with Dave at Aardvarc, I've got a couple of sources as well (email me offline). -KB

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you may want to consider finding an 80-82 E21 Getrag 245 3 piece case OD 5 speed - 245's are both somewhat stronger and a bit smaller (narrower in the rear case area) than the later 2 piece case 240's, so they fit the tunnel in an '02 better.

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Tunnel clearance isnt a problem as the shell is caged and the tunnel cut away at the moment from previous ideas. I have this box now so gonna stick with it.

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I've heard the same thing about the 240 being weaker than a 245. You may also want to check with Jack Fahuna @ ProBimmer - Jack regularly rebuilds 4 & 5 speeds.

you may want to consider finding an 80-82 E21 Getrag 245 3 piece case OD 5 speed - 245's are both somewhat stronger and a bit smaller (narrower in the rear case area) than the later 2 piece case 240's, so they fit the tunnel in an '02 better.

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JB,

are you sure your trans is indeed a 240, not a 245?

The only part that'll have a 245 mark on it for sure

is the center housing- I'm pretty sure you'd see 240 on the

bell and tail housings.

(asked another way, is it 2 or 3 piece?)

Personally, I wouldn't rebuild a 130k mile gearbox-

the odds are that it's ok. But you're gambling

that the previous owner wasn't a ham- fisted idiot.

t

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