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G80 swap question

I

iHateVolvoPeople

Active member
Joined
Feb 1, 2014
Location
Midwest
Yup, another G80 thread.

I have a 1993 945T with a g80, should be 3.73s I believe. I also have a 93 245 M47 car with 3.31s (open). If I want the G80 in my 245, I cannot get away with just swapping the guts because the ring and pinion would be different due to the different ratios.

Do I need to swap the guts but leave the stock 3.31 ring and pinion, or do I need to pull the ring and pinion out of my 245 and install the 3.73 ring and pinion along with the G80 guts?

Anything driveline related absolutely terrifies me and I?d almost rather pay a professional to do this work, but figured I?d also ask here.

TIA
 
If you’re happy running a 3.31 rear, then it’s as simple as removing the differential, fitting your 3.31 ring to the G80 diff, the re-install the diff.

John
 
Jaypee_6680 said:
If you?re happy running a 3.31 rear, then it?s as simple as removing the differential, fitting your 3.31 ring to the G80 diff, the re-install the diff.

John
Click to expand...

I would prefer the 3.73 for some more oomph, but if it?s easier to swap and keep the 3.31s, that?s what I?ll do.

Thank you.
 
Jaypee_6680 said:
If you’re happy running a 3.31 rear, then it’s as simple as removing the differential, fitting your 3.31 ring to the G80 diff, the re-install the diff.

John
Click to expand...

What if the pinion frome one set and the ring gear from the other set are not evenly worn and the teeth meet at a weird angle?
 
https://www.240turbo.com/volvorearends.html

This should tell you all you need to know.

As long as you’re using a matching ring and pinion, and the backlash is within spec (it was when I did mine), then you’ll be fine.

To use the 3.73 you’d need to install the 3.73 pinion in your 240 casing. Chances are you’d need to re-shim to get your backlash in spec, which involves removing carrier bearings etc.

All can be done, but you’ll need new bearings and much more time.

If you’re happy with your 3.31 then you’ll probably get away with a straight swap.

I think others may have miss-read my first reply. For clarity, you must always use the matching ring and pinion sets, which can be done most easily with the 3.31 as you can bolt the 3.31 ring to the G80 diff.

John
 
Jaypee_6680 said:
https://www.240turbo.com/volvorearends.html

This should tell you all you need to know.

As long as you?re using a matching ring and pinion, and the backlash is within spec (it was when I did mine), then you?ll be fine.

To use the 3.73 you?d need to install the 3.73 pinion in your 240 casing. Chances are you?d need to re-shim to get your backlash in spec, which involves removing carrier bearings etc.

All can be done, but you?ll need new bearings and much more time.

If you?re happy with your 3.31 then you?ll probably get away with a straight swap.

I think others may have miss-read my first reply. For clarity, you must always use the matching ring and pinion sets, which can be done most easily with the 3.31 as you can bolt the 3.31 ring to the G80 diff.

John
Click to expand...

Perfect, looks like I?ll be keeping the 3.31 for now due to time constraints. Thanks against John!
 
Jaypee_6680 said:
I think others may have miss-read my first reply. For clarity, you must always use the matching ring and pinion sets, which can be done most easily with the 3.31 as you can bolt the 3.31 ring to the G80 diff.
Click to expand...

Rings and pinions are machined as a set, they wear as a set, but I guess those machine shops are just being pernickety.

Never mind, carry on.
 
Just checking. His English seemed crystal clear to me, twice in the same thread. Your MO on here is trolling. I noticed how you removed the banned members from your signature. Nice. As if that wasn’t trolling. Caught yet again with your hand in the cookie jar.
 
Jaypee_6680 said:
If you?re happy running a 3.31 rear, then it?s as simple as removing the differential, fitting your 3.31 ring to the G80 diff, the re-install the diff.

Almost !
You also need to remove the bearings to swap over the shims from your original diff to the G80 diff (each to the same side). You'll need new bearings to replace the one's you destroyed taking them off.
You can try leaving the shims as they are but chances are you'll end up doing it all again. At least the second time you do it it's a lot quicker!
Tim
Click to expand...
 
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