Front Diff Problem

[Mr.Massive]

Hey Guys,

Ive just replaced the front diff in my stagea engine to the gts4. I had a mate come round to do it who was a mechanic and i am just concerned about the yoke (part where the front shaft connects and spins the diff centre). It doesn't seem to be moving at all even with a few jolts with a wrench. The hubs spin when i turn them however the yoke doesn't, which tells me the spider gears are ok. Im thinking it just needs alot of pressure on it which is hard to do at the moment due to my car being on jack stands. Should it be ok to connect the front shaft to it and hopefully it will turn as it seems to be stuck?

Any thoughts guys? Cheers

[turboedsloth]

did he rebuild it or just replace it with a 2nd hand unit?

[blind_elk]

Did your mate also swap over the pinion gear?

[doo doo]

Get someone to hold one wheel for you while you spin the other- if the diff is stuck then you won't be able to turn it

[blind_elk]

Did your mate also swap over the pinion gear?

Another thing - did you also swap the rear diff. The car will have serious problems if the front and rear diff ratios don't match.

[Luciano]

posting on behalf of Mr.Massive

did he rebuild it or just replace it with a 2nd hand unit?

he replaced it with original front diff centre out of the gts4 (rb25de)

Did your mate also swap over the pinion gear?

this we're not sure of. this is potentially the gear causing no spin. I'm thinking that the mechanic may have presumed that this gear in question was an identical item

could this one be the problem?

Get someone to hold one wheel for you while you spin the other- if the diff is stuck then you won't be able to turn it

can give this a try

Another thing - did you also swap the rear diff. The car will have serious problems if the front and rear diff ratios don't match.

no. as per first quote, the front diff was replaced so it will match the rear

[Luciano]

Did your mate also swap over the pinion gear?

just got confirmed this part was definitely changed.

would you guys think it'll be safe to bolt her all up and take it for a drive? ive got a feeling it just needs a bit of a good forced turn from the gearbox to come unstuck. Just dont want to break anything!

[turboedsloth]

i wouldnt be driving it if you dont wana break anything. get your mechanic friend around again to look at her

[Deano 1]

when i re-shimed to diff in my old silvia drift car, it was pritty stiff once all bolted back togethor, as i tightened the 4bolts that hold the centre in the housing i had to keep rotating the diff using the tailshaft flage and a socket on the bolt on the inside of it, but when it was all tight and full of oil it was still fairly stiff to turn, eg= u needed a tool to turn it, i bolted it in the car and went for a run up the street that put it back on the hoist and it free'd up,

so depending how hard it is the turn atm will matter if u drive it or not, can u turn it round with a tool?? or is it just fullly locked up?

[Luciano]

i'm gonna give this a try with a tool or bar that i can get some leverage with. as the car is on jack stands leverage is hard to find

will let you know what happens! cheers for the reply mate