Parts List
(1) Bellhousing adapter
Hardware:
(4) 82° tapered seat allen drive bolts
(4) 5/16” NC x 2 ½” grade 8 flange-head bolts
(6) 5/16” NC x 1 ¼” grade 8 flange-head bolts
(9) Viton o-rings, front side,7/16” OD (1 EXTRA)
(9) Viton o-rings, back side, 5/8” OD (1 EXTRA)
Tools Required (to install kit onto transmission)
3/16” Allen socket
1/2” socket
Torque wrench
Moly based grease
Transmission
The bellhousing needs to be machined off of the TH400 case (Figure 5) to allow the ZD30
bellhousing and BDE adapter to be fitted. Fortunately, this is the very same requirement to
fit a JW Performance Ultrabell. Utilizing this technique allows the transmission to be easily
converted to any application that is serviced by the JW Ultrabell, so there is no value lost
with this modification to the transmission.
TIP: the transmission case must be machined 0.010” to 0.040” below the pump surface to
allow the adapter plate to position properly on the pump. This typically means that the
transmission will need to be disassembled to do it the right way. Do not cut the oil pan rail
to the same depth as the rest of the housing; the adapter plate is relieved on the bottom to
allow the oil pan rail to remain un-modified.
Note: some late TH400 pumps are only drilled for 6 bolts –do not be concerned if you have
this type of TH400 pump, 6 bolts torqued properly are more than enough to handle the loads.
