I offer Overdrives
to fit Jeep, Scout, Mahindra and Mitsubishi vehicles. I carry new
and rebuilt
PTO-type overdrives. (Rebuilt units are subject to
availability.)
For Jeep Willys Wagons
and Pick-Ups, I also carry some parts for the 2WD Borg Warner (Rancho)
Overdrives. Also For vehicles with Borg-Warner (Rancho)
equipped Spicer Dana-18 Transfer cases
All prices
are subject to change before this website can be revised. Please contact me
for the latest prices when ordering. Images on this page are
thumb-nailed for quicker viewing. Click on each image for
full-size versions.
Instructional Guide
to installing a PTO-Type Overdrive from a Dana-18 Transfer Case
can be found here.
Instructions for removing
a PTO-Type Overdrive from a Dana-18 Transfer Case can be found
here.
An
Overdrive Parts List and Drawing can be found here. (Adobe Acrobat Reader Required)
The CJ3B
page has a great technical article on the benefits of an Overdrive with
Engine RPMs and Speeds here.
Shifter Kits and
Boots are sold separately.
New ATV Mfg.
Overdrives - $875
All new gear
parts with reconditioned aluminum housings and a newly-designed brass
shift fork.
#5671 - 26 Tooth x 6 Spline
Front Shift
#5672 - 29
Tooth x 6 Spline Rear Shift
#5674 - 29 Tooth x 10 Spline Rear
Shift (For T14 Transmission Only)
#5675 - 27 Tooth x 6 Spline
Front Shift (MB/GPW WW2 Jeep Only & Hotchkiss M201)
Special Applications:
#5676 - 31 Tooth x 10 Spline
(Mitsubishi Jeep Only) ($940.00)
#5683 - 30
Tooth x 10 Spline (Mitsubishi Jeep Only) ($940.00)
#5684 - 29 tooth X 10
spline (Mitsubishi Jeep Only) with D-18 t/f case ($940.00)
#5677 - 6 Spline OD minus Bowl Gear
for Low Gear Transfer Case Kits ($677.00)
#5678 - For Terra Low equipped
transfer cases - Rear Shift Only ($940.00)
#5679 - For Jack O'Brian (JB
Conversions) equipped transfer cases - ($940.00)
#5680 - 29 Tooth x 15 Spline (Mahrinda
Jeep Only) - ($940.00)
#5681 - 29 tooth X 21
spline Ford built Brazilian Jeep with 4 speed transmission ($940.00)
#5682 - 29 tooth X 23
spline Torqueflite equipped Scouts with D-18 t/f case ($940.00)
New Saturn
Overdrives - Rear Shift Only - $950.00
#915670 - 26 Tooth x 6 Spline
#915672 - 29 Tooth x 6 Spline
#915674 - 29 Tooth x 10 Spline
#915676 - 31 Tooth x 10 Spline
New Saturn
Overdrive to fit Terra low gear set - $970.00
Rebuilt Warn
and Husky Overdrives - $750 (Subject to availability)
These
assemblies are rebuilt/reconditioned overdrives that contain some new
and used parts. All bearings, seals and gaskets are new.
Available in front and rear shift configurations. Please
note: The location of the shift handle is the same with either version.
Overdrives
provide a 25% reduction in engine RPM, increasing gas mileage and
decreasing wear and tear on drivetrain components. To see some
gear calculations, please visit Rick
Grover's website. Courtesy of Rick, here is an installed
view:
Overdrive
Shifter Kits: Other applications also available. Call for
details. Depending on the application, minor trimming of the
floor and/or transmission cover may be required.
T90 w/
Single-Lever Transfer Case - Rear Shift Overdrive - $68 (Not shown,
similar to above)
T84 w/
Dual-Lever Transfer Case - Front Shift Overdrive - $68 (Not shown,
similar to above)
T86 w/
Single -Lever Transfer Case - Rear Shift Overdrive - $68 (Not shown,
similar to above)
T14 w/
Single-Lever Transfer Case - Rear Shift Overdrive - $68 (Not shown,
similar to above)
SM-420 4 speed to D-18
shift kit - $68 (Not shown, similar to above)
SM-465 with Advance
Adapters 1" adapter kit 4 speed to D-18 shift kit - $68 (Not shown,
similar to above)
T-18 4 speed to D-18
shift kit - $68 (Not shown, similar to above)
T-98 4 speed to D-18
shift kit - $68 (Not shown, similar to above)
T350 Automatic to D-18
Tranfer Case with Rear Shift Overdrive - $68 (Not shown, similar to above)
T14 w/ Dual-Lever Transfer Case - Rear
Shift Overdrive - $68 (Not shown, similar to above)
NP-435 to D-18 Tranfer Case with Rear Shift Overdrive - $68 (Not shown,
similar to above)
RTS 4 speed overdrive to D-18 transfer case with rear shift Overdrive -
$68 (not shown, similiar to above)
Mitsubishi
style Jeep - Rear Shift Overdrive - $68 (Not shown, similar to above)
FC-150 and FC-170
manual shift linkage for rear shift overdrives. I have built this
in two pieces to reduce shipping costs. - $75
This
universal shifter is for any non-stock transmission application such as
the SM465 or SM420, TH350, TH400, 727, T18, T98, etc. The bracket
secures to the top of the transfer case, using the upper two mounting
bolts.
A piece of
sheet rubber, at right, fits over the stock boot. The retaining
ring, at left, holds both boots against the floor. Depending on
the application, the retaining ring may need to be bent by hand to
match the contour of the transmission tunnel area.
Designed for
a single lever transfer case or other custom applications.
Here's an
installed view of the shift lever on a CJ-2A with a dual-lever transfer
case, showing the trimming required on the transmission cover, with
shift boot removed for clarity:
Visit
the CJ-3a page for an excellent guide to installing an
PTO-type Overdrive
1. Remove
the five 3 ½” mounting bolts that attach the
aluminum housing of the rear assembly to the transfer case only.
2. You
should be able to get that aluminum housing to come back a little, so
that you can put a screw driver in between the aluminum housing and the
transfer case.
3. Be
careful not to damage the aluminum housing when you use two
screwdrivers, one on each side to pry the casting to the rear.
4. What is
happening is that there is a cage bearing inside of a part called a
spyder blank, and this spyder blank shrinks and conforms to the shape
of the cage bearing housing making it a tight fit.
5. You have
to pry evenly because if you don’t you only make it tighter
to remove. When you have it back far enough that your screwdriver is
too small, then add a piece of wood for a shim and continue until it is
removed. This is the only way to remove the rear assembly without
causing possible damage to other parts.
6. Do not
remove any other bolts or parts as they do you no good except to give
you a bag full of parts that you my lose.
7. Next
remove the internal snap ring inside the barrel assembly inside the t/f
case by compressing it.
8. The next
part is the tab washer. Now this part serves the purpose of a lock
washer as it locks the drive nut from turning (unscrewing) when the OD
is installed. It may be tight, if so carefully use a 3/8”
extension and wiggle it inside the tab washer and that
should allow
you to remove it.
9. Once the
tab washer is removed, take a ½” extension and unscrew the
drive nut inside the barrel gear to remove this from the transfer case.
The drive nut will not come out as it is a part of the barrel assembly.
10. If you
have an extremely difficult removal and need some help, don’t
hesitate to give me an e-mail or a call and I will
try to help you with it.
11. Do not
use a torch!!!! Do not remove any other bolts other than the 5
3½” bolts to remove!!!!! Worse case senerio, remove
the assembly as shown in this picture (Coming soon) and send it to me
so you don’t damage it.
Besides the
popular Warn overdrive, there is another type you might find on an old
Jeep. The Borg-Warner overdrive is different than the Warn
overdrive. It was originally designed for two wheel drive
applications. An adapter kit was once available to mount one
behind the Dana 18 transfer case. The rear driveshaft had to be
shortened. Overdrive was only useable in 2WD. The
Borg-Warner unit was a forerunner of the Warn overdrive. Once the
Warn unit was introduced in the early 1960's, sales dropped off
considerably because of the complex installation.
I carry the following electrical components for the Borg-Warner
Overdrive;
Governor with gear (used)---------------$ 45.00
New Reverse rail switch---original------$ 30.00
12-Volt rebuilt solenoid-------------------$ 120.00
Solenoid core charge--$30.00
6-Volt rebuilt solenoid--------------------$ 120.00
Solenoid core charge--$30.00
New relay (from England)----original---$ 85.00
New kick-down switch--original----------$ 35.00
Replacement cable assembly--------------$ 54.00
Externally fused relay-----------------------$75.00
Replacement speedometer cable and housing, teardrop style
w/clamp---$48.00
Replacement speedometer cable and housing,
standard style---$16.00
If you need any other internal component parts, please call, I have
an extensive supply of used Borg-Warner parts available.
Overdrive Decal - Free with any
purchase on this page. Previous overdrive buyers, please send a stamped,
self-addressed envelope for your free decal. All others,
the decals are available for $2.50 with free postage.
T90 w/ Dual Lever Transfer Case - Front Shift
Overdrive
T90 w/ Dual Lever Transfer Case - Rear Shift
Overdrive
Cable Shift for Jeep FC Trucks - $48
Shift Boot for Dual Lever Transfer Case - $18 
Shift Boot for Custom Applications - $15