manual gearboxes

[charged vp]

is a v6 5 speed the same as a v8 one?
if so will a v6 one bolt up to a v8?

[samuels]

is a v6 5 speed the same as a v8 one?
if so will a v6 one bolt up to a v8?

T5 yes....will fit V8

[charged vp]

are they the same or is a v8 t5 stronger

[VN_Luke]

afaik they are both the same in terms of strength, internals, ratios etc..

unfortunately v6 and v8 T5 Manual gearboxes are not interchangable because of differnt bellhousing on the gearbox.

[charged vp]

could i just get a v8 bellhousing aswell

[VN_Luke]

It's a nice theory, but i think i recall the input shaft is a differnt size (length/splines) - note that they key word in that sentance is 'THINK'.

have you found a v6 T5 you want to chuck behind an 8?

[charged vp]

ive got a v6 manual and want to put an 8 in it

[iwishmyVNwouldstart]

the ratios are slightly different

V6 Ratios V8 ratios
First: 3.25 2.95
Second: 1.99 1.94
Third: 1.29 1.34
Fourth: 1.00 1.00
Fifth: 0.72 0.73

now i dont know this from actually taking them apart, but i have been going over thew procedure alot recently cause my tranny needs overhauling, and it doesnt mention anything different for the v6 and v8, but im not not sure, it woulkd make sense to at least have a stronger clutch given the increased tourque output. where did you find the t5 and for how much, i need a new one too...
cheers

[samuels]

afaik they are both the same in terms of strength, internals, ratios etc..

unfortunately v6 and v8 T5 Manual gearboxes are not interchangable because of differnt bellhousing on the gearbox.

what are you on boss....exactly the same....so what your saying is that GMH has gone to the trouble of changing bolt patterns on the T 5's just to be smart?

[VN_Luke]

..... the bolt pattern from bellhousing -> gearbox I imagine will most likely be the same

from bellhousing -> motor = different for v6 and v8.

from searching on other forums apparently the input shaft is different, too? more splines on the v8 one?

[samuels]

..... the bolt pattern from bellhousing -> gearbox I imagine will most likely be the same

from bellhousing -> motor = different for v6 and v8.

from searching on other forums apparently the input shaft is different, too? more splines on the v8 one?

exactly...thats what i was saying...bellhousing to engine is different sure..
but bolt patern is same as gearbox to back of bellhousing regardless of V6..V8

i wouldn't think the input shaft is different,i can't see GMH making 2 input shafts for the one gearbox

[elemenohpee]

its a no go i went and got a new box after mine shat itself and i asked for a v6 t5 but they gave my v8 and the bellhousings are different. Didn't try to change bellhousings though so yout guess is as good as mine

[Wonderboy]

i have rebuilt all 3 (yes 3) types of t5, the v6 has closer ratios and different bell housing and different input shaft. the v8 has more splines on the input shaft and has taller gears and the v8 block bolt pattern in the bell housing
i have rebuilt the same t5G gearbox twice due to snapped main shafts, out of an sv88 vl which had a twin throttle bodied 5 litre and was stright out of a written off walkinshaw, im not sure on ratios but it had 28 splines on the input shaft and when i tried to order a bearing kit i couldnt find a single place with one, i had to order seperate bearings from america for the cluster shaft, input shaft etc and also had to get 2 main shafts which were $400 a piece AUD and they had a different part number to a normal v8 t5. the bearings ended up being slightly bigger than standard v8 ones and were a hefty price, i think the bloke paid roughly $190 for an input shaft bearing.

so no, you cant put a v6 gearbox behind an 8. or vise versa. and if anyone can get their hands on a t5G hang onto it they must be worth stacks by now.

[samuels]

i have rebuilt all 3 (yes 3) types of t5, the v6 has closer ratios and different bell housing and different input shaft. the v8 has more splines on the input shaft and has taller gears and the v8 block bolt pattern in the bell housing
i have rebuilt the same t5G gearbox twice due to snapped main shafts, out of an sv88 vl which had a twin throttle bodied 5 litre and was stright out of a written off walkinshaw, im not sure on ratios but it had 28 splines on the input shaft and when i tried to order a bearing kit i couldnt find a single place with one, i had to order seperate bearings from america for the cluster shaft, input shaft etc and also had to get 2 main shafts which were $400 a piece AUD and they had a different part number to a normal v8 t5. the bearings ended up being slightly bigger than standard v8 ones and were a hefty price, i think the bloke paid roughly $190 for an input shaft bearing.

so no, you cant put a v6 gearbox behind an 8. or vise versa. and if anyone can get their hands on a t5G hang onto it they must be worth stacks by now.

i could very well be wrong...but every 5 speed i have overhauled or even pulled out of a VN have been T5's,so i'm assuming the manual VN's came out of the factory with T5's fitted.just grabbed a workshop manual to gawk at before i actually posted,it says manual transmission=T5 from 88-91.

[Blown V6 Hatch]

As said before the input shaft from v6 to v8 are different but i believe the difference in not that much and a v6 input shaft can be modified to go behind a v8. Then it is just a matter of changing bellhousing clutch & flywheel. All vn to vs series 2 commodores were t5 gearbox. The T5G mentioned earlier came out in the VL walkinshaw.

[Wonderboy]

what was a getrag in? from what i know its in vt-vy v6's? anyone know?

[Blown V6 Hatch]

In the v6 the getrag came out in vs series 3 and up. VS Series 3 ran VT series 1 running gear. In the v8 vs series 3 and vt series 1 also ran the getrag, then vt series 2 changed to the tremec t56 with the introduction of the gen 3.