Driveshaft size / CV boot

Hi all,

Looking for some help.

How do I figure out what size CV boots I shall need, both inner and outer. I understand that there is a choice of either 90mm and 100mm driveshafts, but it's been a fair few years since I swapped everything out so I can't remember what route I went.

If anyone has any leads to some decent CV boots that'd be great too.

1989 caddy, 4T 020 gearbox.

Thanks in advance.

 

To determine the Size of your axles
Wrap a string around the Inner joint next to the differential.

Wrap it around and mark it at the overlap both strings, then with a ruler (not the Queen), if the distance between the marks is a little over 11" 11.13 it is a 90mm axle, Just under 12.5" it is a 100mm axle.

I didn't think there was a difference between the outer boots.

The Inners are determined by the axle flange.

Briano1234 said

To determine the Size of your axles
Wrap a string around the Inner joint next to the differential.

Wrap it around and mark it at the overlap both strings, then with a ruler (not the Queen), if the distance between the marks is a little over 11" 11.13 it is a 90mm axle, Just under 12.5" it is a 100mm axle.

I didn't think there was a difference between the outer boots.

The Inners are determined by the axle flange.

Brilliant thankyou. I wasn't sure whether or not the diameter was different between the two! In regards to the inner boots then, this is dependent on the gearbox flange size?

ryves said

Briano1234 said

To determine the Size of your axles
Wrap a string around the Inner joint next to the differential.

Wrap it around and mark it at the overlap both strings, then with a ruler (not the Queen), if the distance between the marks is a little over 11" 11.13 it is a 90mm axle, Just under 12.5" it is a 100mm axle.

I didn't think there was a difference between the outer boots.

The Inners are determined by the axle flange.

Brilliant thankyou. I wasn't sure whether or not the diameter was different between the two! In regards to the inner boots then, this is dependent on the gearbox flange size?

Yes the inners depend on the size of the flange on a 90mm flange the bolts all align, but on a 100mm flange they are offset and you have to align the axle so two bolts align and inserting the 3rd bolt it starts… I have always hated that offset.