Description

Chrysler A-598, T-750 Service Manual

If you are digging into a Chrysler A-598 or T-750 manual transaxle without the factory paperwork, you are wasting time and risking a comeback. I have seen guys try to set bearing preload with a feeler gauge and a prayer. That ends with a whining transaxle and a customer who remembers your name. This Chrysler A-598, T-750 Service Manual is the original OEM document – 52 pages of procedures straight from the engineers who designed the box. No aftermarket interpretation, no missing steps.

Start with the gear ratios and lubricant selection on page 2. Using the wrong additive or skipping the sealant spec will cost you a leak inside 500 miles. The manual calls out the exact gearshift pattern and lists the approved sealants. I have torqued enough extension housing bolts to tell you: the factory number is the only number you trust.

Transaxle Identification and Gear Ratios

This section tells you how to decode the tag on your transaxle and match it to the right gear set. Page 1 has the identification information. The manual lists the ratios for first through fifth and reverse. If you are swapping a used unit, verify your ratios against the chart before you install it. A mismatched final drive will throw your speedometer off and burn up the differential.

What Does This Manual Cover for the A-598 and T-750?

Everything from clutch problems to input shaft seal removal. The table of contents includes General Information, Description and Operation, Diagnosis and Testing, Service Procedures, Removal and Installation (15 separate components), Disassembly and Assembly (input shaft, intermediate shaft, differential, synchronizer, shift cover, transaxle case), Cleaning and Inspection, Adjustments, Special Tools, and Specifications. That covers the whole rebuild.

For example, the Removal and Installation section alone has procedures for the gearshift knob, boot, cables, mechanism, back-up lamp switch, crossover lever, selector lever, crankshaft position sensor (2.5L VM diesel), axle seals, shift shaft seals, transaxle, input shaft front bearing retainer, and input shaft seal. Each step is spelled out with removal and installation separate – no ambiguous sentences.

3 Critical Diagnosis Sections

Under Diagnosis and Testing you get: Common Problem Causes, Hard Shifting, Noisy Operation, Slips Out of Gear, Low Lubricant Level, and Clutch Problems. Each one has a list of likely causes and the first check to run. For slips out of gear, the manual points you to the crossover cable adjustment and the synchronizer inspection procedures later in the book. That saves you chasing a worn shift fork when the real issue is a loose cable.

Service Procedures cover fluid drain and fill. Drain the old lube, refill with the specified grade, and set the level. The manual tells you the exact fill procedure – no guesswork.

Read the Bearing Preload Procedure

Intermediate shaft bearing preload and differential bearing preload adjustments are on pages 46–48. The manual includes the general rules on servicing bearings. If you skip the preload step, the bearing will overheat and the gear mesh will shift. Use the special tools listed on page 49 – they are not optional. I have made that mistake once on a customer’s Daytona. Never again.

OEM vs Aftermarket: Why Factory Documentation Wins

Every spec in this manual came from Chrysler’s engineering department. The torque values, the sealant part numbers, the bearing adjustment procedures – they are all verified. I do not trust aftermarket manuals for these old Mopar units because they often copy generic values. Page 49 lists the NV T750 (A-598) manual transaxle fluid fill specification. That is the exact number from the factory. Use it.

If you need a companion manual for a different Chrysler platform, check the Chrysler Stealth 1993 Service Manual – 1286 Pages Factory OEM for a full car coverage, or the Chrysler Stealth 1993 Service Manual – 434-Page OEM Factory Specs for a condensed version. For a truck-based application, the Chrysler Nitro R/T 2007 Service Manual – 1799 Pages Factory OEM covers the whole vehicle. All factory OEM, no aftermarket shortcuts.

External references on Manual Transmission basics are fine for theory, but when you have a wrench in your hand, you need the factory procedure. Same goes for Manual Transmission troubleshooting – use the Chrysler manual first.

Why 52 Pages Is Enough

A lot of DIY guys think a bigger manual is better. For a manual transaxle, 52 pages of focused, factory documentation beats 500 pages of generic theory. Every page has a specific job – identification, diagnosis, removal, disassembly, inspection, adjustment, specifications. You can finish a rebuild in a weekend because you are not flipping through unrelated sections. That is the value of a dedicated service manual.

Does the manual cover the 2.5L VM diesel engine?

Yes. Page 7 includes the crankshaft position sensor installation for the 2.5L VM diesel.

What torque values are listed?

The Specifications section on page 49 lists fluid fill capacity, gear ratios, and bearing preload adjustments. The Adjustment section (pages 46–48) gives the detailed procedure for setting intermediate shaft and differential bearing preload including the required shims and torque sequences. The manual does not publish every bolt torque in a table – instead it embeds the torque values in the removal and installation steps for each component. For example, the input shaft front bearing retainer installation includes the bolt torque. You follow the procedure, you get the correct torque. That is how a factory manual works – no separate torque chart to misinterpret.

52 pages of pure factory documentation. No filler. No reprints from third-party publishers. This is the original Chrysler service manual for the A-598 and T-750 transaxle. If you are rebuilding one of these units, stop guessing. Access the Factory Manual from AutoRepairManuals and get the specs that match your transaxle.