Hey guys. I am tossing up the idea of removing the whole rear end off a NA and putting it into my TT. Together with removing the Hicas and TT stuff from the engine bay and replacing it with the NA power steering stuff. What im wanting to know is how much weight will it save and will it handle worse or better without the HICAS? I have also read that NA diff will provide better acceleration but higher cruising RPM and lower top end speed. Can anyone confirm. Cheers
the final ratio of the NA diff is higher. from memory, the TT is around 3.7 and the na is about 4.0 which means basically means less top speed for NA diff but more acceleration. actually just pulled apart a skyline gts-4 diff on the weekend, had a demolished front bearing on the pinion. Diff oil is so stinky
yep, would make a huge diff on acceleration. I wander if the crown and pinion from a skyline diff would transplant into the z32 diff, I know they both r200's and similar
Did you do it yourself? How much work was required and is there any tips you might want to share with me lol
Not worth doing even if it was possible. Looked at doing it... The z32 na diff is just fine. The uas slot car and fleets car had modded subframes to accommodate the r32gtr diff. Straight na subframe is a quick easy upgrade. I'm in the process at the moment actually. Couple pointers: Subframe from a 2 seater or a 2+2? - no difference between subframes but handbrake lines differ in length Tailshaft - u can use a na rear end, separate at the centre bearing and use the tt front section. Either go this way or get a 1 piece made. The weight saving and no hicas (IMO) is worth it... Although may change the centre of gravity and allow more float and less traction on the rear end. The difference in ratios is awesome but off the line, you will get more wheelspin. It is by far the cheapest upgrade vs performance mod available....
Side note I would imagine a complete na drive shaft would fit. Not needing to separate the shaft and potentially throwing it out of balance. Different is in the diameter of the pipe that makes up the shaft. Bigger on the tt vs the na. I don't recall there being any different in spline count either when inserting into the rear of the box. But I may be wrong. Either way you're distrupting the engineering of strength when mis matching the two halves. So you may ad well just use the complete na shaft and not upset the balance.
Yeah did it myself - its not a hard job at all. Drop exhaust Undo calipers/handbrake cables/ABS lines/Hicas lines (if still connected) Undo 4 big bolts with jack under subframe Drop subframe. Reverse the above and its back in. Make sure you have a good jack - and preferably a 2nd jack if your doing it by yourself like I did as its hard to get the subframe lined up to reinstall it as it has to be prefectly aligned on all 4 studs. I replaced the Diff bushes with ES ones with it in the car - wish I'd done it with the subframe out of the car..... Gearbox sender requires unbolting the gearbox mount, and dropping the rear of the gearbox to get the sender in and out - but its all pretty easy to do. And much better :br:
Ahhh I forgot to mention, I am using an auto. Spline size and count are different between TT tailshaft/box and NA tailshaft/box with auto only. Manual NA shafts into TT box's fit just fine.
do it. bypass the hicass, put all the na power steering gear in the tt. and the subframe. i think someone said the na cradle diff etc is about 30kg lighter so may disturb that centre gravity but how much .... personally i think its well worth it, the acceleration you'd get is great
Niiice work. I was already convinced on doing it but just wanted to make sure it was actually well worth it
2 jacks You don't need two jacks, two aces or a full house, all you need is a hoist... Easiest zed job ever putting it back on
