This Group Buy is for the Over the diff mount currently known as the "R/T Mount" That is typically sold on HybridZ.org by a great member named RoostMonkey. I've chosen to make and sell the Mount, not for a profit of any real amount, but as a secondary option to those who cannot find him, or wait for him to build them and ship them.

I asked him about patents and such and got this for an answer....

"No, I dont have a patent. Actually I used Ron Tyler's basic design ( hence the name " RT mount" ) with his permission and added my own little details to make what I feel is a slightly cleaner product. Theres nothing to stop someone from doing the same. If your thinking of making these, do us all a favor and make them better ( if possible ).Dont just copy this design. I only do this to help you guys out and to put a little cash in the Z fund."

So In Honor of Ron Tyler and his original design, I will keep the R/T Mount name on the product, to make sure the originator gets his due respect and recognition. So here we go.........

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This Group Buy is for the R/T Mount for the S30 Zcars.

Here's a link to some great info on the R/T Mount.. http://www.classiczcars.com/forums/showthread.php?t=35995

The mount is a 3/16" mild steel mount that bolts to the body of the S30, using the 4 bolt holes that the "Diff Strap" normally uses.

Normally, the stock or upgraded diff of the S30 (R180, R200 & LSD) is mounted to the car using the stock crossmember and a rubber/steel mount. The Nissan mount has been well known for failing under heavy stress, age or Horsepower, by means of the rubber seperating from the steel of the OEM mount. When this happens, the Diff typically makes a Loud and very apparent "THUD" against the driveline tunnel, scaring or irritating the driver and leaving only the Mustache bar to hold the diff in place. Not very safe at all.

The R/T mount will allow the use of a GM Transmission Poly Urethane Mount and also lower the front of the diff by about 1" which is typically better for those who use the Tranny's bolted to an LS1, SR20DET, RB25, 26 and 30 DET and DETT's as well the Borg/Warner T5 and T56 trannies.

The R/T mount, sold by me, will be $60 and shipping inside the Continental US is included in the $60 price.

The Mount sold at HybridZ is $55 or $62 w/ PayPal. I don't work for a Metal Fab business so I don't get the opportunity of an in-house price. I will make barely anything on this project as I will be paying much more for the same mount and covering the price of shipping, fuel and packaging/stuffing, using the $60 payment.

So as per RoostMonkey's suggestion and my own personal experience, I will be IMPROVING the mount. The fuel lines have to be raised on almost all S30's by about 1/2". The NEW Design will include a modification to the mount to account for this small issue. 2 more bends will be added to the design, giving the mount a 3/4"w X 1"deep indent on the upper right hand side of the mount, to allow the fuel lines to remain in their stock location, without alteration or modification of their original position.

YOU WILL NEED TO ORDER A GM TRANS MOUNT FROM JEGS FOR $21+S/H and drill out the mounting holes a little bit to allow the large diff bolts to pass thru it **Pics Below** It is a "Fail Safe Mount" so even if the Urethane rips or seperates, the mount will NOT fail.

It has also been pointed out by a few members that a bump stop can used instead of the GM mount. This will allow the use of the stock mount and a bump stop mounted on the R/T mount, to essentially "Sandwich" the diff. This will eliminate both up and down movement of the diff.

Now the down side...... I do NOT have a PayPal Account I can only accept Cash, USPS Postal Money Orders or WalMart Money Orders Made out to David W. Irwin. Send your Payment with your order stating.........

Your Name

Return Address (clearly printed or typed)

Quantity

Mail your order to me at........

David W. Irwin

6421 105th St. NE

Marysville, WA. 98270

You can PM or Email me your request but money and an order in my hand, is what will get you your mount.

Todays date is Nov 10, 2009. I'm told that I will possibly be able to start shipping orders by next Wednesday, the 18th. Or maybe even sooner if possible. I'm ordering a batch of 50 in hopes of taking care of everyone at the general moment. I'll be on a net 30 so if you said you WANT one, and change your mind, it'll come out of my pocket. So please be kind to this somewhat broke individual and don't tell me you want one, then say, maybe? or next month. At a measily price of $60, you'll get a quality product that will bolt into your S30, improve the mounting of your stock diff, allow you to "up" your HP without worry of a torn mount.

I think I've covered everything. So feel free to start sending me your orders and payment and I will start shipping them out hopefully as soon as the 18th.

Edited November 15, 200915 yr by Zs-ondabrain
rewrite in proper form

Actually, I did just that. I cut my bumpstop so that it is already applying firm pressure at all times. Had to squish it a bit during install. Did that on purpose to firm things up as much as possible. Seems to work well that way, and I notice no increase in NVH over stock.

I'm doing that then. Figure the solid diff mounts used in racing show you can go to zero movement so I figure what you did is the proverbial "Goldilocks Zone".

Actually, I did just that. I cut my bumpstop so that it is already applying firm pressure at all times. Had to squish it a bit during install. Did that on purpose to firm things up as much as possible. Seems to work well that way, and I notice no increase in NVH over stock.

Did you put any bushing grease on the bump stop before install? I was wondering if it would squeek without it? I will definitely be using this method.

Marty

Did you put any bushing grease on the bump stop before install? I was wondering if it would squeek without it? I will definitely be using this method.

Marty

Nope. And no squeak so far.

This almost makes me glad I haven't had time to install mine. This latest info here is GREAT information. I am definitely going to be keeping the bump stop oversized when I do mine.

Do you have any still for sale? If not I'll check on yhe hybrid site

Check with Roostmonkey on Hybriz.

Mine sold pretty fast.

Dave

Update on my installation of Dave's RT mount into my 70 240z: I changed all the stuff in the back to bring her up to current specs. New 72 driveshaft ,mustache bar, hangers 72 diff mount and went ahead and decided to install the RT mount. I was using the bump stop so Rich(MOTORMAN7) and I were doing the same thing but with different methods. I could see that if I installed the mount as advertised that the bump stop would be rubbing against the moving yoke on the front of the diff.....It wasn't going to be far enough back to contact the top of the front of the diff where it is supposed to hit. I flipped the mount around and drilled a hole symmetrically on the other side but even a little farther toward what is now the back of the reversed bracket to get all the rearward movement I could get (the bump stop actually had the edge hanging off about 3/8 of an inch). No problem......I cut off the 3/4 inch that Arne suggested....bolted the awesome bracket up and when everything went together it worked beautiful (I also used the new stock 72 diff mount for double duty). The car drives like a dream.....no noise no bumps and no vibration with one exception. When I nailed the little monster for all she's worth I got a vibration-grinding noise under my butt.....only when you really nail it though. I brought her back and took a look. Here's the problem...when you reverse the bracket in the early cars the little support metal bar on the bracket now lays 3/8's of an inch above that little spinning yoke on the front of the diff.....So...when you really nail it as I tend to do from time to time, you squeeze the bump stop enough to make slight contact with the spinning metal yoke. I'm going to try to drop the drive shaft and Dremel out the area above the yoke. So if anyone is doing this mount in an early car I would suggest grinding an area out for clearance. Rich...you can take a look at yours and see if that support rail is directly above your yoke. Great job on the mount though Dave....You are the man! Guy

Edited March 28, 201014 yr by Diseazd

Any chance more of these will happen in the future?

NOt likely. Unless you find 45 other people who want one. If not, talk to Roostmonkey over at hybrid.

Dave

Undoubtably the best bang for the buck that you can install in your Datsun! This thing really does what's it supposed to. The bump stop is the way to go as far as simplicity. Use both the original and the bump stop for best results (damps the unit). Dave ......your product as usual is superb! Guy

Edited April 4, 201014 yr by Diseazd

Hey Dave,

Any chance this might happen again? I have not heard back from Roostmonkey and it seems like a few people here would be interested? I am just sorry I missed this last time.

Msged you JC, I got a spare.