Probably a stupid question but I want to know if the 6 cyl tailshaft in my lx with aussie 4 speed can be used at all when I put a v8 with trimatic in it? is the length ok and the toke needs to be changed or will the yoke fit (transmission end) but needs to be put on different tailshaft??
will 6 cyl aussie tailshaft suit v8 trimatic
Started by
_piranha_
, Aug 19 2007 06:40 PM
9 replies to this topic
#2
surfmaster
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Marineboy
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Posted 19 August 2007 - 06:50 PM
The yoke will fit, the back end of a trimatic is the same in 4 6 or 8, I suspect the length is the same but to be sure i would measure them up for comparison. The V8 tailshaft may be a different diameter.
#3
_ozbox_
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Posted 19 August 2007 - 07:44 PM
if you are staying with the 6cyl diff centre then the 6 tailshaft is ok for the v8 conversion....same length same spline in yoke at box...
#4
_piranha_
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Posted 19 August 2007 - 09:56 PM
will the 6 cyl diff centre & tailshaft be strong enough? I will be putting in a mildyly worked 253, extractors, 350 holley, cam, bored 40 thou, performance timing gears. also how strong are the trimatic boxes? as far as I know this one is standard do you think it will last?
#5
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Posted 19 August 2007 - 10:29 PM
banjo centres are the same in strength.difference is only the size and width of the universals and yokes on tailshaft and diff...trimatic will do the job...these mechanical parts are strong enough to survive but not if you abuse them..
#6
_the_new_a9x_replica_
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Posted 22 August 2007 - 09:47 AM
the tailshaft is almost identical
But the V8 ones are Fatter and any engineer with half a brain will spot instantly
But the V8 ones are Fatter and any engineer with half a brain will spot instantly
#7
_73lj202_
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Posted 22 August 2007 - 10:49 AM
Not all, some 253's ran the same size diameter tailshaft (6 cyls) but with the bigger uni's. 308's from memory had the larger diameter tailshaft.the tailshaft is almost identical
But the V8 ones are Fatter and any engineer with half a brain will spot instantly
#8
_73lj202_
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Posted 22 August 2007 - 10:51 AM
^^^^ what he said, I ran a worked 308 with the trimatic,6 cyl tailshaft and yokes/uni's. Never broke, but I didn't thrash it either.banjo centres are the same in strength.difference is only the size and width of the universals and yokes on tailshaft and diff...trimatic will do the job...these mechanical parts are strong enough to survive but not if you abuse them..
#9
ls2lxhatch
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Posted 22 August 2007 - 02:55 PM
If you have an open banjo diff and coarse spline axles, then the axles will snap before the uni's. I had this setup for about 10 yrs, in that time I snapped two axles and replaced the uni's once.
If you have fine spline axles and/or an LSD then the uni's may be the weak point. It appears that Holden engineers felt the 6cyl tailshaft and Uni's were marginal with a V8 otherwise they would not have upgraded them.
Having a tailshaft let go is something that should be avoided at all costs. It would be safer to fit the V8 tailshaft and yokes regardless of the diff and axle combination. You could also encounter problems with your insurer if the tailshaft lets go and you are involved in an accident.
If you have fine spline axles and/or an LSD then the uni's may be the weak point. It appears that Holden engineers felt the 6cyl tailshaft and Uni's were marginal with a V8 otherwise they would not have upgraded them.
Having a tailshaft let go is something that should be avoided at all costs. It would be safer to fit the V8 tailshaft and yokes regardless of the diff and axle combination. You could also encounter problems with your insurer if the tailshaft lets go and you are involved in an accident.
#10
_73lj202_
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Posted 22 August 2007 - 08:59 PM
What ls2lxhatch mentioned is pretty right,Mine ran fine spline and were fine, like I mentioned earlier, holden seem to run 2 tailshaft sizes, I remember a friend had a brand new Torana V8 and when we had a look at it was running the 6 cyl diameter shaft with the larger unis, whereas some also ran a larger diameter, but I guess like anything GM did,things differed. I remember another friend had a 3.3 auto that ran a 2.78 diff,we were stationary at the lights the car stalled and I started up again and from neutral to drive just threw it into drive,we blew the frt uni, 3 hrs later we were on our way. So I would probably suggest a larger tailshaft. But depends on how you are going to drive it, like my last post I had a worked 308,and never blew anything, but I didn't do burnouts etc, I just respected the drive train.If you have an open banjo diff and coarse spline axles, then the axles will snap before the uni's. I had this setup for about 10 yrs, in that time I snapped two axles and replaced the uni's once.
If you have fine spline axles and/or an LSD then the uni's may be the weak point. It appears that Holden engineers felt the 6cyl tailshaft and Uni's were marginal with a V8 otherwise they would not have upgraded them.
Having a tailshaft let go is something that should be avoided at all costs. It would be safer to fit the V8 tailshaft and yokes regardless of the diff and axle combination. You could also encounter problems with your insurer if the tailshaft lets go and you are involved in an accident.
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