Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Tree]

Hi i am building a redtop corsa rwd and have been told mv6 gearbox is same  fitting can anyone tell me if this is correct believe its a r25-r28 box?
thanks in avdvance

[Omegatoy]

hmm my mate built a turbo redtop and pretty sure he used the omega 2 litre r25 box, that held up with 300bhp going through it
not sure if the v6 box will bolt up?hence he used the 2 litre box?

[Andy H]

I think I read somewhere that all the GM family II engines have the same bolt patterns  :-/

The diameter of the input shaft bush will probably change as the gearbox gets heavier and the clutch splines and release mechanisms are probably different too. Good luck 

[Marks DTM Calib]

R25 or R28 will be fine.

V6 and big block 4 pot have the same bolt pattern

[omegabsw]

R25 or R28 will be fine.

V6 and big block 4 pot have the same bolt pattern

Sorry to hijack the thread but would this be the same with the 2.2? meaning that I could bolt a v6 into a 2.2 omega?

[Marks DTM Calib]

R25 or R28 will be fine.

V6 and big block 4 pot have the same bolt pattern

Sorry to hijack the thread but would this be the same with the 2.2? meaning that I could bolt a v6 into a 2.2 omega?

Yep as the 2.2 is just a stroked 2.0

[Tree]

cheers for that guys

[Kevin Wood]

Ford type 9 is another option, if one is needed.

Popular in kit cars so bellhousings to mate it to a C20XE are commonplace.

It won't take as much power as the R25/28 but you'll find a much more extensive range of gearkits for it should you want better ratios.

Kevin

[2woody]

in general there are two types of box that you're looking at here, both are Getrag 240.

the R25 is a standard box, more often than not fitted with the small output "donut".

the R28 is a stronger version of the same, usually with the larger output "donut". The extra strength comes, I think, from shot-peened gears.

either will be ok for your application - it's vehicle weight and traction that kills gearboxes.

[Tree]

thanks does that mean the r28 will fit straight on with the shaft etc and no mods as i have sourced a box?

"in general there are two types of box that you're looking at here, both are Getrag 240.

the R25 is a standard box, more often than not fitted with the small output "donut".

the R28 is a stronger version of the same, usually with the larger output "donut". The extra strength comes, I think, from shot-peened gears.

either will be ok for your application - it's vehicle weight and traction that kills gearboxes."

[2woody]

R28 will fit straight on a 2.0 XE.

make sure the spigot bearing is installed in the end of the crank, and whatever flywheel combination you're using has the same height as the gearbox is expecting.

you must, however, use an R28 from Omega and NOT from Carlton / Senator.

[Tree]

thanks again have found another forum thread giving the needle bearing part no. so that is sorted can you advise on what flywheel and clutch to use?

R28 will fit straight on a 2.0 XE.

make sure the spigot bearing is installed in the end of the crank, and whatever flywheel combination you're using has the same height as the gearbox is expecting.

you must, however, use an R28 from Omega and NOT from Carlton / Senator.

[Marks DTM Calib]

thanks again have found another forum thread giving the needle bearing part no. so that is sorted can you advise on what flywheel and clutch to use?

R28 will fit straight on a 2.0 XE.

make sure the spigot bearing is installed in the end of the crank, and whatever flywheel combination you're using has the same height as the gearbox is expecting.

you must, however, use an R28 from Omega and NOT from Carlton / Senator.

You can use the flywheel and clucth setup from the original engine, an alternative is one from a front wheel drive Vx V6 of the mid 90's

[Tree]

hi have just got all the bits together and tried assembling, the r28 clutch plate is 9.5" where the redtop is 9" and the splines are different  r28 has bigger and less splines. any suggestions? on a lighter note the spigot bearing fits [smiley=2vrolijk_08.gif]

[2woody]

I can suggest a clutch plate tomorrow morning for you.

is the clutch release bearing the right height ?