Need info to assist with Nissan rear end in 72 triumph

[Alv8l]

Hi everyone,
Sorry to barge in on the Nissan forum as I don't have a Nissan car. What I do have is a British 72 triumph I am modifying to make a bit more power. Unfortunately the triumph rear end is whole fully inadequate for anything above 200hp and the wheel tends to come off unexpectanly at times.

I do have a differential out of a 1991 q45 which fits in with a special kit. I'm a bit stumped with the q45 drive axles as I don't have the clearance with the Nissan outside cv to get through the triumph carrier hub. The q45 cv joint is about 4 inches diameter at its widest point including the cv boot. The triumph carrier hub tapers from 4 inches to 3.1 inches. I'm able to get an adapter to bolt on containing a 350z wheel bearing that will allow me to attach a s13 hub (same triumph bolt pattern ) to the outside of the tr6 carrier hub. Problem of course is I can't push in the drive axle far enough in to get good spline shaft engagement and have the cv turn freely. There are axle hubs out there but at $700-800 per axle it gets a bit pricey. So finally to the questions:

1. Can someone give me or know the measurement at it widest point for the 240sx cv joint. It needs to be pretty accurate to let me know how much clearence I have to see if machining out the tr6 carrier hub is feasible
2. Are the q45 drive axles the same diameter as the 240sx? I know the splines fit in the hub so I assume so but I would need to machine them to attach the 240sx shaft to the q45 differential via the inside q45 axle u joint. The Q45 different is 6 bolt. That is unless the 240sx axle is all the same bolt pattern then I just need to shorten them.
I hope this is all not to confusing. Any other Nissan axle combinations you can think of that may work throw them out there. Thanks.

[centralcoaster33]

Hello. Are you getting Richard's Good Parts kit? Do you have the kit already or are you trying to anticipate it before the bits arrive? I read that it has adapters to bolt your Triumph driveshafts to the R200 differential. I'm a bit unlcear on what you'd be doing with the Q45 driveshafts and figure you'd want/ need to use the stock Triumph ones. I figure you'd just use those adapters. Are you putting in a full subframe or just the differential?

I can measure my CV joints for you tonight, but looking at photos of q45 and 240sx shafts side by side (yeah, we photo stuff like that to discuss differential options here), they all apear to have the same diameters within a quarter inch or so. Certainly not the inch plus smaller you're hoping for.

Most of the shafts have different lengths or bolt patterns, but simlar diameters. Perhaps you need the differential output shafts with a different bolt pattern? Those are something people here buy sometimes and have different lengths depending on the internals of the differential.

What bolt pattern do you have on your R200 diff and on your Triumph driveshafts? I think you want the 5 bolt pattern for your diff (star shaped), not the 6 bolt pattern (3 pairs of bolts in triangle shape). Is that the issue?

[Alv8l]

Thanks for the reply. Yes I have the diff kit. yes my stock unjointed drive shaft will bolt up to it but triumph hub/wheels are notoriously known for coming off even at regular tr hp ranges. The stock axle shaft is rated to handle 200hp max. I'm planning at least that and likely 300 hp when done. Uprated axles run 700 to 800 plus dollars per side from Richard (an excellent product) just a bit pricey for some. So we are trying to look at a more cost effective option (if there is one)
My diff is 6 bolt evenly spaced from a VLSD out of a q45. It may well be that the cv joint from a 240 XS is to big just need to know. If the cv fits inside the carrier hub with enough room to spare I will have the axles shortened to fit my needs. I may well have to go to a different make cv. Just need the cv size. There may well be the option to machine a slimmer cv boot. Thanks for the measurement.

[centralcoaster33]

Oh, okay, I gotcha. Good luck with the hub/ wheel/ axle interface.

I measured mine relatively quickly. The rubber boots are 4 inches, both inner and outer. The metal portion is about 3.5 inches (mine are practically triangle shape so my diameter dimension is more approximate).

[Alv8l]

Crap picked up'some s13 hubs and the q45 spline shaft does not fit. Guess I will have to pick up some 240 sx drive axles or possibly just the spline shaft portion of the cv joint and machine the q45 axle to fit the cv joint. Does anyone know of any other vehicle drive shafts that will fit the 240sx hubs?