Advance Adapters AX15 - Manual (Page 46)

For the transmission bolt patterns,
refer back to the Transmission
Identification section of this
manual.
46
FULL GM CONVERSION BELLHOUSINGS FULL GM CONVERSION BELLHOUSINGS FULL GM CONVERSION BELLHOUSINGS FULL GM CONVERSION BELLHOUSINGS FULL GM CONVERSION BELLHOUSINGS
With the introduction of the NV4500 in 1993, both GM & Dodge found it necessary to change the transmission bellhousing bolt
pattern because of the overall size of the transmission. The bolt pattern on these transmissions has been spread out and
enlarged in order to meet the transmission general configuration. When using these transmissions with engines other than a
Chevy or Dodge engine, or when retrofitting a vehicle prior to 1992, you will require a new bellhousing or adapter plate. We offer
bellhousing conversion kits that will help you assemble the NV4500 to all GM engines and Ford V8 engines.
There are a few basic guidelines to consider when deciding which bellhousing you’ll need.
For GM transmissions:
1. Year of transmission - 1995 & earlier or 1996 & later
2. Hydraulic or Mechanical clutch linkage
For Dodge transmissions:
1. Hydraulic or Mechanical clutch linkage
2. Do you need a full bellhousing or can you use an adapter plate?
3. If a full bellhousing is needed, a GM input shaft will be required and the transmission
will require the endplay to be reset.
FULL GM BELLHOUSING CHOICES: FULL GM BELLHOUSING CHOICES: FULL GM BELLHOUSING CHOICES: FULL GM BELLHOUSING CHOICES: FULL GM BELLHOUSING CHOICES:
The bellhousing bolt pattern on the GM NV4500 transmission differs from the bolt pattern from the standard GM transmissions
(old Muncie truck-type transmissions). From 1992-95, GM NV4500s had their own specific bolt pattern. In 1996, GM started
using the same case design as the Dodge NV4500 case. In addition to having the same bolt pattern, GM NV4500s now have an
index diameter of 5.600”. The GM NV4500s, however, use an internal hydraulic release bearing. When GM switched to this
bearing assembly, they removed the snout from the retainer where a release bearing would ride. This assembly has no
provisions for a conventional throw out bearing and release arm.
With the different transmission configurations, you must make sure that the correct bellhousing and adapters are ordered. You
will have four possible choices as to which bellhousing will be used with your Chevy V8 engine. (
NOTE: These bellhousings
should not be used with a diesel motor due to starter clearance issues). The choices are as follows:
Choice #1 - Stock GM Bellhousing used in 1993-1995 GM
trucks previously couple to a GM NV4500
This bellhousing uses a special slave cylinder configuration that is
located on the passenger side of the vehicle. Vehicles that have the
front driveshaft on the passengers side will not have sufficient clear-
ance around the stock slave cylinder assembly, this bellhousing will
not be compatible on Jeep vehicles 1971-86, Toyota Land Cruisers, or
GM 4WD vehicles up to 1991. This factory GM bellhousing can be
ordered from us under
P/N 712580 (shown left), and will include all
of the necessary slave cylinder components. The recommended clutch
disc and pressure plate are Centerforce components,
P/N 383735
(clutch disc) and P/N CF361877 (pressure plate).
Choice #2 - Stock GM Bellhousing used in 1996 & Newer GM trucks previously
couple to a GM NV4500
This bellhousing uses a special internal design slave cylinder that bolts to the front retainer on
the transmission. This factory GM bellhousing can be ordered from us under
P/N 712586
(shown right), and will include all of the necessary slave cylinder components. The use of the
stock GM clutch disc and pressure plate are recommended for this bellhousing.
Choice #3 - AA Bellhousing - P/N 712577
For GM NV4500 transmissions 1992-95, we manufacture a new aluminum bellhousing with the proper bolt pattern and index
diameter of 5.125”. This bellhousing can be used with all Chevy 4.3 V6 and V8 engine conversions. The bellhousing is
adaptable to both mechanical and hydraulic clutch controls and is furnished with a new clutch release arm and boot. The boot
may need to be modified to provide the correct arm location. The bellhousing has the clutch release arm access on the driver's
side of the vehicle. The advantage of this bellhousing over P/N 712580 (option #1) is that our bellhousing has provisions for most
stock linkages (hydraulic or mechanical). The adaptability of these different linkages to our bellhousing makes the NV4500 to
your Chevy block an easy adaptation.