Advance Adapters AX15 - Manual (Page 55)

Factory bellhousing modified for front shift
rail clearance on the NV3550.
Crossmember P/N 716000 installed.
The NV3550 is 1/4” shorter than the factory 3 or 4
speed. Since the NV3550 is slightly taller than stock,
a 1” body lift is recommended.
NV3550 to 1966-77 BRONCOS:
The NV3550 transmission is an ideal transmission swap
for the early Broncos. This 5 speed is rated at 300
ft./lbs. at 7200 GVW. The weight of this 5 speed is
97 lbs., which is similar to the stock 3 & 4 speed
transmissions. The overall size and length make
it an ideal fit. The gearing of this 5 speed is as follows:
1st 4.01:1; 2nd 2.32:1; 3rd 1.40:1; 4th 1.00:1; 5th 0.78:1,
and Reverse 3.57:1.
The transfer case adapter we manufacture for this transmission uses an adapter plate and spud shaft that couples to the NV3550
transmission. The adapter plate offers two rotation options for the Dana 20 transfer case: the stock rotation which is 42 degrees
and a higher rotation of 34 degrees. The higher rotation may require a body lift for proper clearance. The transfer case adapter
comes with a transfer case shifter linkage bracket which only fits the “T” style shifter.
The stock Ford bellhousing will also need to be adapted. The NV3550 has an input
shaft length of 7-7/8”. We manufacture an adapter plate that bolts to the front of this
transmission. This adapter provides you with the proper indexing and bolt pattern
to couple to the stock bellhousing. The stock bellhousing will require slight
modifications. Another consideration is the clutch disc spline. The stock Ford is
1-1/16” 10 spline, and the NV3550 is 1-1/8” 10 spline; therefore, a new disc is
included in the adapter plate kit.
The new crossmember for the
NV3550 transmission must also
be used. Since this 5 speed does
not offer angular support pads
and our adapter is two short to
have these provisions, we de-
signed a new crossmember sup-
port for the new transmission.
Our new crossmember bolts to the stock crossmember frame hole and
includes a new rubber support. The crossmember is designed to fit both stock
exhaust and header applications.
NOTE: This crossmember will require
some additional modifications when using an Atlas transfer case.
Retaining the Dana 20, we offer a complete transmission package which
includes the transfer case adapter, bellhousing adapter, crossmember,
transmission, and shift handle.
P/N 27-3520R - NV3550 to Bronco Dana 20
This kit includes: This kit includes: This kit includes: This kit includes: This kit includes:
P/N 50-9920 - NV3550 to Bronco Dana 20 T/C adapter (1.40” long)
P/N 712544 - NV3550 to Ford bellhousing 4.848” index (adapter length 7/8”)
P/N 716000 - NV3550 crossmember support
P/N 26-3550R - NV3550 transmission
P/N 27-3520AA - NV3550 to Bronco Dana 20 (no transmission)
This kit includes: This kit includes: This kit includes: This kit includes: This kit includes:
P/N 50-9920 - NV3550 to Bronco Dana 20 T/C (1.40” long)
P/N 712544 - NV3550 to Ford bellhousing 4.848” index
(adapter length 7/8”)
P/N 716000 - NV3550 crossmember support
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