Outer Limits 4x4 Board

Quick Question: How do you tell the difference between a NT diff (3.9) and a WT Diff (3.7)?

Cheers

external or internal?

external - spring pads are 2" wider approx on the WT 3.7 diffs

internal - count the crown and pinion to devide = ratio

also NT 3.9 are 4 pin diffs front and rear, where the 3.7 are 4 pin rear only i think.

the nt diff has small flanges and 8mm bolts.
the wt has larger flanges and 10mm bolts

Internal.

jhsuzi wrote:Internal.

count the teeth and divide crownwheel by pinion.

Thanks for that Guys.

pre mid-88 WT sierra have a four pinion front diff as well. Everything after June/july 88 they went to a 2 pin carrier. mine is an april 88 model and it had a 4 pinion front diff.

hey guys little off subject... i wanting to fit a front lockright that i already have.. where can i get a 4 pin carrier from as mine has a 2 pin?

jono_785 wrote:hey guys little off subject... i wanting to fit a front lockright that i already have.. where can i get a 4 pin carrier from as mine has a 2 pin?

i think dank just answered that 4 you

pre mid-88 WT sierra have a four pinion front diff as well. Everything after June/july 88 they went to a 2 pin carrier. mine is an april 88 model and it had a 4 pinion front diff.

jono_785 wrote:hey guys little off subject... i wanting to fit a front lockright that i already have.. where can i get a 4 pin carrier from as mine has a 2 pin?

PM dank, he has a couple lying around

ah sorry i not specific enough. can u use the narrow track 4 pin carrier?

Yes.

Steve.