Let the fun begin.... Starting the reassembly of the transmission was very interesting. We installed a new durabond rear case bushing, verifying the clearance is always a good idea. After the new case bushing came the low piston. The piston was a little snug to install with new lips seals but after a bit of finesse it slid right in. Prepping the case for final assembly included hone stoning the case, checking for a case flatness of less than .005". Installing a new 3rd apply check ball capsule is an absolute must.
Time to get down to business, the rear planetary carrier and 4l70 5 pinion planet with new AC Delco Torrington bearings is very critical to a long lasting rebuild. Rather than an anti clunk spring we used a steel case saver. The center support was next with a new borq warner sprag assembly. The inner sprag race was replaced with the supplied race from the sonnax smart shell kit. Making sure to lube the bearing on the back of the shell, we installed the sun gear and shell together. The sonnax wide sun gear bushing installed helps carry the load of the front planetary reaction shaft. Now the front 6 pinion planetary and reaction shaft and carrier are installed. Same as the rear bearing, plenty of lubricant is always a good idea. Coming in last is the Sonnax output shaft. With the gear train assembled, checking rear unit end play we have verified everything is ready to move forward.
Starting on the input drum is always a great time. The sonnax smart input drum is very robust compared to the factory drum. In the bottom of the drum we used a bonded blue 3/4 piston new #7 retainer as well as a bonded forward piston. The overrun piston is a sonnax piston that comes with the smart drum. Installing the sprag into the race and assembling the two sprag half's completed our sub assembly and allowed for final assembly of the drum. Using new raybestos clutch's we stacked up to the 3/4 clutch very carefully. Now to use the sonnax backing plate and the new raybestos clutch's and steels. Torquing the retaining plate to 51 inch pounds finishes the assembly of the drum.
The reverse input drum was inspected for a total surface flatness of now more than .005 of clearance. Installing new durabond bushings in the front and rear of the drum was next. The piston received new lip seals and was installed in the drum. Factory clutch stack in the drum completed the drum.
Time for the pump. Due to rotor failure we opted to clearance and fit the pump body with a 10 vane pump kit from transtar and steel rings provided in our transgo pro kit. Although we are using transgo products in the transmission, we also installed a sonnax lock up valve as well as sonnax springs. The pressure regulator circuit is improved with the transgo boost valve and transgo pro valve kit. The stator body is machined in house. The lock up feed circuit is modified as well in house.
Now that the input drum and reverse input drum are installed a new raybestos ultra band goes in and the pump is installed. The band is controlled by a Corvette servo as well as a sonnax 4th servo. Pin travel is adjusted to a total of .070 of travel.
Thanks for watching along as we have assembled this transmission. After seeing the final product and watching it work in the vehicle it's been a lot of fun to see how it progressed. For any questions please comment on the video.
9 дек 2021
