Product Description
3-4 Z-Pak™ Clutch System
1988-UP
Takes the Heat Without Coning
Instructions Included!
7 Steps to Ultimate Clutch Performance
- Use a 1988 or later input drum, identified by narrow snap ring groove and a 0.093'' 3-4 snap ring.
- Used only a 3-4 apply ring measuring 3.675'' +/- 0.005'' inches tall, commonly referenced as a Number 7 apply ring. This stamped steel ring rests on top of the 3-4 piston. The number '7' is stamped into the part for identification. The OEM number is 8685043.
- Pre-soak all friction plates in automatic transmission fluid (ATF) prior to final assembly.
- First, install the special grooved apply plate (bottom) with the groove facing upward. Do not attempt to install the narrow external spline friction plate, with "TOP" printed on it, into the machined groove. Set it aside until Step 6.
- Install the friction plates, beginning with an external spline friction plate with friction material facing upward (away from the special grooved apply plate), then an internal spline friction plate with friction material facing upward, continue alternating until you have installed seven external spline friction plates and seven internal spline friction plates.
- Important! Install the special external spline friction plate, identified by the narrow band of friction material, with the word "TOP" facing up. This eternal spline plate does not look like any of the others. It is critical to install this plate last. Using it anywhere else in the pack will damage the clutch pack and void the warranty. NOTE: Use of load release springs is optional. Use of load release springs recommend for RPM above 5000.
- Finally, install the .145'' pressure plate provided, followed by the factory snap ring. Clearance should be within the 0.050''-0.07'' range. If not, install optional external spline shim to adjust clearance to 0.050''-0.070'' if necessary. It is recommenced to check actual piston travel by placing a dial indicator on the backing plate and apply air to the third clutch feed. If clearance is measured with feeler gauges, it is important to measure in two places at the same time, 180 degrees apart, for even loading of the pressure plate. Failure to do so may cause incorrect end play reading.
About Raybestos Powertrain
Raybestos Powertrain is one of the largest developers and suppliers of automotive friction material products in the world. Raybestos Powertrain produces OE quality transmission friction bands that meet stringent quality standards required in today's complex transmissions. Raybestos Powertrain clutches are made with high grade friction material that meets or exceed OEM specifications. Raybestos clutches will provide you with superior shift quality and greater durability to your rebuild, every time.
Product Videos
Custom Field
Product Reviews
1 Review Hide Reviews Show Reviews
-
Z-PAX saves my business
I do a lot of tow haul with my 1500 truck. I cant afford to buy a larger 2500 series. The 4l60 e failed for the second time after a standard master rebuild. Again the 3-4 clutch pack and piston. I looked at changing to a standard xmission. Then i watched a video on the z pax. So decided to try it. I installed it and returned to hauling. I noticed an immediate change in the performance of the 4l60 e in tow haul mode. It pulled better shifted smoother and operated at lower rpm. Also in normal road travel mode the motor is operating at lower rpm saving gas and still providing power in its normal range. So i am sold on this product. It changes my 1500 to a sleeper 2500 tow haul truck..thanks ray bestos.