kj280z

I believe the 300zx NA axles have the same bolt pattern as the 280zxt CVs so the MM 280zxt adapters would be a popular seller if this was the direction - plus the 300zx NA CVs are easy to find and very cheap

John I didn't... I have the MM adjustable LCA's. Which points would you like me to measure for you?

Both sides have to be flipped (shortened) to obtain proper margins and even then they're tight. On the passenger side we did not re-install the cap since the adapter has a machine fitting... we ground off 1/8" of the end of the shaft, then filled the adapter (and CV) with lube and installed without the cap on the passenger side... it has been fine for 400 miles of driving... Bugs the heck out of me that Ross has not called me back or answered my emails on this!!!!! Been over 45 days!

Have you tried adjusting the rod on the Clutch master cylinder so it has more throw? I know there's some risk in blowing out the seal in your slave but might be worth a try... I'm using a Wilwood Clutch Master cylinder with a resurfaced stock flywheel and clutch masters clutch and it works perfect

I will have the car on a lift to do the bad dog rails in a week or so and I will follow-up then

It was news to me too, but would explain a lot of the issues people have run in to.... I didn't have to test for bind - it wouldn't even compress enough to install! Once I modified everything, it fit... I checked for bind by removing the spring and compressing the suspension by hand - it is still VERY close though... And yes I'm positive the shafts are installed on the correct sides... I even flipped the cage on the passenger side to shorten it! (flipped both cages)

I installed the Z31T CV shafts with the MM adapters last night. (75 280z) I shortened BOTH shafts by flipping the cages. I had plenty of room on the drivers side, but on the passenger side EVEN WITH the MM adjustable lower control arms, there was no way the passenger side would work (the MM control arms widen the rear which provides more room depending on the camber adjustment). I can now see why so many have ran into issues trying to make this work... The only answer on the passenger side is to run the CV without the end cap (the adapter provides an adequate seal just fill it with grease), and to grind 1/8" off the end of the shaft. Additionally I ground some material off the stub axle shaft (about 1 thread worth)... Hopefully it will be good enough. Test drives so far seem to be that it's fine. No issues with the sway bar hitting the CV boot with the MM rear control arms which was good... I still think it would be worth having some shortened center shafts made for the Z31 NA CVs and to use the 280zxt MM adapters - maybe someday - Now that I have this working I'll leave that to someone else to try...

Jon On the crank pulley clearance - I'm running a under drive crank pulley and it provides lot's more clearance... I didn't like the clearance of the stock pulley to the stock steering rack - too close for comfort if you ask me... The under drive pulley provided a perfect amount and it looks like it would solve your problem as well

More info on the fuel tank x2!!!

Agreed - I was thinking that if I was able to have this shop make several sets of shortened center sections for the 300zx NA axles, that folks might want to run them with the 280zxt MM adapters I have the adjustable rear control arms, so I'd probably be fine with the Z31T conversion, but it was a real PIA finding the Z31T axles, so I was looking for a more readily available solution... All I would do is work to get the measurements correct, then give out the number to his shop and you guys could get them directly or have them done by whoever you like since it should be an easy part to have made - that is of coarse if you're able to get the adapters from MM I've been trying to call/email Ross for a few days now and have not heard anything... Would love to discuss this option with him...

There's plenty of posts on the topic - some had to grind off some material at the end so the shafts would not hit the end cap etc... if you search you'll find it... Some have ruined their differentials because they bind, others have bought re-manufactured units and the companies who rebuilt them used the wrong length center shafts - all kinds of stuff... Since they're pushing the limits on being too long, there isn't too much margin for error so it could be several things.

John - Thanks for the reply - While I don't have a set of Z31 NA axles at the moment, the pictures I've seen appear that the bolt pattern is in fact 3 pairs of 2 bolts (6 total) rather than 6 equally spaced holes. - If that is true, I'd love to hear if the bolt pattern is the same as the 280zxt CV Axles - if it is, the companion flange adapter from MM for the 280zxt axles should work with a shortened 300zx NA CV axle... Hoping that's the case

Hey all I know that the CV Axle discussion been done several times - I have read all the posts - That's why I'm posting this... Being that several of you have run into the 300zxt shafts being too long in certain instances (various ride heights and an assortment of other reasons), I'd like to try to approach it from a slightly different angle... Firstly, the 300zxt axles are becoming very hard to find... Secondly the 280zxt axles are also hard to find. (I have all of the adapters and CV axles to do both of these conversions so I have all the reference parts) We obviously have 2 options for adapters for both of those CV Axles combinations via Modern Motorsports, but the availability of the axles and some of the challenges folks have faced make it worth a further discussion. I know the 300zx NA shafts (84-89) are too long - but those are very plentiful. Some have raised concerns about various aspects of them not being as strong as the 300zxt shafts - but would they be good enough? I have a shop near me that does a great job of making custom shaft lengths - If I had the center shafts made to the correct length and if they could be used with the 280zxt adapters from Modern Motorsports, that might just be the answer... I'd love to hear the thoughts on that... I'd like to hear some feedback on the correct lengths that folks have run which would avoid all the binding issues and eliminate the need to flip cages and all the rest of the things required to run the Z31T MM adapters... When I start this project within the next week or so I'll be taking my own measurements as well... Just feels like we need a more viable and plentiful solution for the CV Axle conversion - some of the other porsche conversions seem to be way over priced IMHO

I installed this Wilwood unit - It was $100 via Jegs and immediately available - Summit was on back order but probably have them now... It's a 50/50 split... the only thing you'll have to do is widen the mounting holes slightly with a file (5 minute job) and it will bolt on directly... I also had to remake the small brake lines that go to the prop valve - the ones that go off the bottom of the MC to the prop vales that are around 8 inches long - they are standard thread on the MC and your line is metric thread... I'd bet a call to Wilwood would yield an easier way to address that - I'd bet they have the metric fitting for the bottom which would make it a easy bolt on... I'm using this MC with the 10 inch 1976 280z 2+2 booster - that was also a direct bolt in to my 75 280z - You have to lengthen the actuation rod in the booster slightly too - all easy stuff. http://www.wilwood.com/Images/MasterCylinders/Master%20Cylinder%20Photos-Large/260-8794-lg.jpg

Yep - I solved the problem with my Walbro 255 It was multiple minor issues all combining to make it loud... 1. I had a 90 degree elbow on the suction side of the pump - eliminated it and replaced with a straight through fitting. I also drilled it out as well. 2. The filter from Summit Racing between the tank and the suction side had to go - it was 100 micron but every time I tried to add it into the system after trouble shooting it would add noise - still trying to find a good solution for this 3. Added a filter near the FPR in the engine compartment 4. Lowered the pump in relation to the tank 5. Put a larger hose (1/2") on the suction side of the pump

Trust me - I tried it via Autozone 3 times (and 3 other places) - they have it cross referenced wrong - you'll get a 15/16" master from them, but it has the wrong horizontal bolt pattern, the wrong reservoirs, and the bleeders are different - It won't work... They tried ordering it 3 different times for me... finally gave up - They finally called the distributor and got the same answer you'll get wherever else you call - no longer available send in your current MS for a rebuild... Hard to do if you don't have one to start with! LOL I'd be surprised if all of a sudden there's availability again - they all get them from the same few distributors for the most part It would be great if they were available - I would definitely buy one as a backup so keep us posted - would be great news

New ones are hard to find and expensive if you can find one. Rebuilds as of 2 weeks ago are no longer available as well. I spent 3 whole days calling every parts distributor. I started to get a few leads but decided it wasn't worth my time. I now have a 76 2+2 booster and a 1" Wilwood master cylinder. Works great IMHO

Yeah that's a 15/16" Master cylinder... I found that it's no longer available or if you're able to find one it is close to $200

Zfan what was the answer as to the differences you found? I've heard they the NA Z31 CVs are longer and have the 6 bolt pattern but that's all I've found I wonder if getting some shorter shafts made would allow them to be used with the 280zxt companion flange adapters... Pro/cons? I have a local shop that makes the shafts with any spline and length combination, so I'm considering having him make mine Might actually be worth a group buy... Who knows

Hmmm - I was basing the 84-89 years (which I have verified with all parts sources that I've called - they do all cross reference) on this article on MM website: http://www.modern-motorsports.com/xtrainfo/z31-cv-conversion.pdf If there's further information that would refine the CVs to just 87-89 years I'd like to know more

So I have been researching various options to convert from my stock half shafts to the 300ZXT shafts and using the MM Adapters... Seems like EVERY parts source no longer carries them! They all want to rebuild your existing ones - since we don't own 300zxt's that we can steel them from for this, that's a problem! Has anyone been able to find a reliable source for these CV's? Just to stop any questions - the ones required are the 4 bolt 300zx TURBO 1984 - 1989 CVs - the 6 bolt CVs that come in the NA 300zx will not work

jacob80 - Did you ever finally get all the issues resolved? I'm curious to hear if you ever resolved all the issues... I'm planning to install these CV's shortly (if I could ever find a set) and would like to know all the gotcha's ahead of time

I'll take a set if you still have them (84-89 300zx turbo 4 bolt pattern)!! Ken

Thanks - I decided to go with the RT mount and sent my payment a few days ago -

I have a solid Diff mount - it's great, but I'm looking to drive my car on the street as a daily driver and would prefer an insulated mount - if you have something for the R200 I'm interested. Would also consider a trade for mine ect PM me