diff ratios

[sahtuning2000]

My mates mk1 estate(ex dawson)is starting to come together now,its had a replacement rear screen fitted,the terrible vibration has been sorted(totalled rear g/box mount)but it still seems very gutless on accelaration,now it used to be an auto when new,but is now a MOD,will the auto diff make it worse or better(worse i hope!!)
And what numbers are MOD diffs,he has it listed when i serviced it.

[thealligator]

All manual 2000 were 4.11 and auto 3.7, I believe.

So possable yes.

See what it goes like after you have service it

[fogothdon]

As it is now a 2500 and also now manual, maybe it should have the 3.45:1 diff fitted, that all 2.5 or 2500 manual cars had from new? would be sure to make a difference.

Not sure though if you would need to source a 2.5pi mk1 diff or whether a mk2 diff from a 2500 or 2.5 would slot right in.

This would also help me as I have a whole rear axle, hubs and all, from a mk2 2500s that I was thinking of putting on our mk1 estate, do I need to install the whole or just the diff?

Donald

[AlanChatterton]

All diffs are essentially the same, just different ratio's.

But, the backplates are different. All MKI and Estates (incl MKII Estates) have one type of backplate with a large mounting bar on the back, MKII Saloons have a smaller backplate with small mounting bar.

You can change the backplates over to convert from one to the other.

MKI suspension is different, short driveshafts and a narrower track, and manually adjusting rear brakes. It is a good conversion to chuck the whole MKII rear end in, will give a wider track, better brakes..

[AlanChatterton]

All diffs are essentially the same, just different ratio's.

But, the backplates are different. All MKI and Estates (incl MKII Estates) have one type of backplate with a large mounting bar on the back, MKII Saloons have a smaller backplate with small mounting bar.

You can change the backplates over to convert from one to the other.

MKI suspension is different, short driveshafts and a narrower track, and manually adjusting rear brakes. It is a good conversion to chuck the whole MKII rear end in, will give a wider track, better brakes..

[thealligator]

Dont forget the diff ratio is also dependant on the tyre size.

These cars where designed for 175 sr-13 in mind.

We change my mates 2000 saloon onto 70s what ever and it scream it head off
at a true 70mph.

Your speedo will also be out as well

[Richard B]

ps the 2.5PI was designed for 185/80 x 13"