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Dan, ASE Certified Technician
Category: Dodge
Satisfied Customers: 1694
Experience:  Auto Technician
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I have a 1988 Dodge D100 pickup with a 318, Everyday I have

Customer Question

I have a 1988 Dodge D100 pickup with a 318, Everyday I have to go outside and start the truck up and let it run for about 30 minutes just so I can get the truck to go into reverce. the transmission shifts fine and runs good in forward gear, but reverce is a major headache, I always check and add fluid when needed. I do not know if I need a new transmission or not,
Submitted: 11 months ago.
Category: Dodge
Expert:  Dan replied 11 months ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.

Expert:  Dan replied 11 months ago.

1988 Dodge Pickup 5.2L Eng D100



Reference Number(s): 21-20-93, 21-20-93 REV. A, Date of Issue: October 22, 1993
Superceded Bulletin(s): 21-20-93, Date of Issue: July 23, 1993


Model(s): 1988-93 (B) (AB) Ram Van/Wagon

(D) (AD) Ram Pickup, Ram Cab & Chassis

(N) (AN) Dakota/Dakota Sport/Dakota Cab & Chassis

1993 (ZJ) Grand Cherokee

Group: Transmission

Bulletin No.: 21-20-93 Rev. A

Date: October 22, 1993

This bulletin supersedes Technical Service Bulletin 21-20-93, dated July 23, 1993.

NOTE: This bulletin applies to vehicles equipped with 42RH, 42RE, or 46RH 4-speed automatic transmission.


Some vehicles may exhibit a condition of "no drive" or "delayed transmission engagement. The customer may complain that the vehicle does not move after shifting from "Park" into "Drive" or "Reverse".


The condition could be difficult for the owner to demonstrate. The cause is a rough finish on the sides of the park tooth on the overdrive annulus gear. It may only occur under certain combinations of grade, vehicle loading and which park tooth happens to be engaged. The transmission actually engages, however, because the pawl has not released, no torque is transmitted to the drive shaft and the engagement is not felt. If the throttle is opened slightly, it may appear as if the transmission is in "Neutral". If the throttle is opened aggressively, the engine acts as if the transmission is in gear but the brakes are being applied.

Prior to any attempted repairs all possible causes of "delayed engagement" or "no drive" should be checked.

  • Low oil level

  • Shift cable/Linkage adjustment

  • Transmission low line pressure

  • Plugged transmission filler

  • Broken pump drive




Part No.


Overdrive Annulus Gear (Use with all gas engines)

(###) ###-####/p>


Overdrive Annulus Gear (Use w/ Cummins diesel engine)

(###) ###-####/p>


Gasket - Extension Adapter

(###) ###-####/p>


Pan Gasket (Use with 42RH or 42RE)

(###) ###-####/p>


Pan Gasket (Use with 46RH)

(###) ###-####/p>


This repair involves the removal of the overdrive unit and the replacement of the annulus gear.

1. Remove the overdrive unit.

2. Disassemble the overdrive unit/overdrive gear train to the annulus gear.

3. Install new annulus gear and assemble the overdrive gear train and overdrive unit.

NOTE: Determine the correct thickness of the overdrive piston thrust plate.

4. Install overdrive unit using a new gasket.

5. Fill the transmission to the specified level with Mopar ATF PLUS, Type 7176 Transmission Fluid.

Expert:  Dan replied 11 months ago.

Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.


Customer: replied 11 months ago.
Hello Dan
Thank you for getting back with me on this problem, I will follow your advice and get the part and have this installed, I will get back with you and let you know what happened. Thank you again and have a good weekend.
Expert:  Dan replied 11 months ago.

Thanks you too, sounds like a nice truck you have, very low miles for the year.

Expert:  Dan replied 11 months ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated.

This question is coming up on 7 days which means it will time out and close.

You have already paid to get this question answered, but you have not rated.

Let me help some more. Is there anything else I can help you with?

If I did not give you 5 star service, please let me know what I missed.