Transmission Options On Cefiro With Rb26

[ali farahani]

hi

i am new to this forum then i hope ask my question in right section

i want swap an RB26 on my cefy . it has already RB24 and i want to know if i can use my RB24 trans with RB26 clutch and flywheel and sump from RB24 for this swap ?

want to run the stock motor with stock turbos and only 10 psi of boost i think my trans will handle the power if it bolts right.

my engine is from a 90 skyline then it is push type as my current clutch act

[Nic_A31]

Your gearbox will bolt straight up, no worries. You'll have a standard RB20/non-turboRB25 gearbox on at the moment. They're fairly weak compared to RB25 gearboxes, but as long as you're not doing neutral drops and clutch kicks all day, and trying to quick shift every gear change, it'll hold up fine.

Clutch and flywheel no problems. Just use whatever is on the 26.

The flywheels are all the same, 9.8kg. The clutches will be the same, but the GTR pressure plate is a bit heavier.

The oil sump will be a problem.

24 sump won't bolt up to the RB26.

You can either cut and weld the 26 sump to suit RWD, or you can buy a RWD RB26 sump in from Japan. It'd probably be cheaper to get the 26 sump welded up, but look at both options first.

[ali farahani]

thank u veryyyyyyyyyyy much

can i use my original engine mounts or i should change them to suit RB26?

and the last question is

GTR LSD diff is direct replacement or i have to use whole rear setup from gtr 32?

[Nic_A31]

Engine mounts, not sure.

If the RB26DETT ones dont slot into the crossmember, then take the mounts, brackets and bolts off the RB24. Just a case of what fits, not what suits

The diff is a bit of a pain in the ass.

The diff will fit the cradle, but you'll need to use the drive shafts and hubs (which are stronger than your current ones), you'll need to change the nose on the diff as well, to suit your current tail shaft (unless you have an AWD A31 ??)

Best bet = take out the diff centre from the GTR, put that into your current diff housing. Use the GTR drive shafts, drive shaft flanges, hubs, etc.

[toffy]

Why change the diff?

[Nic_A31]

Skids are better with 2-way diffs

Those LHD / RB24S Cefiro's only came with open centre.

Edited April 6, 2012 by Nic_A31

[toffy]

Yep fair enough , gtr diff is 6 bolt axle shaft , all spaced apart , im pretty sure you need the full axle and hub to make it fit . I can vaguely recall a friend attempting it and failed , ended up buying a s13 lsd in 4.36 as it bolted up to the axles (3X2 bolts )

[(Locky)]

if you go gtr diff you need to use the

stub axels

Half shafts

hubs

as the GTR items are stronger, but also thicker and will not fit in your stock hubs