TRANSMISSION & TRANSFER CASE — 1989–1993 DODGE RAM 5.9L CUMMINS (12-VALVE)

Keep your First-Gen shifting clean and putting power down. CPP Diesel stocks proven parts for automatic 727/518 (A618) and Getrag G360 manual setups, plus NP241 transfer cases, flexplates, deep pans, coolers, rebuild and service items tailored to 1989–1993 D250/D350 & W250/W350.

Shop by Subcategory

• AUTOMATIC TRANSMISSION (727/518) — tow/Street transmissions, converters, pans, valve bodies & rebuild parts.
• MANUAL TRANSMISSIONS — GETRAG G360 — complete units and hard parts.
• MANUAL TRANS PARTS — bearings, synchros, forks, seals & hardware.
• CLUTCH KITS — SOUTH BEND — single & dual disc options for G360.
• CLUTCH KITS — VALAIR — street/tow & performance clutches.
• TRANSFER CASE — NP241 — reman cases & components for 4×4 W-series.
• FLEXPLATES & BOLTS — OEM & performance plates and ARP hardware.
• DEEP PANS & SERVICE — more fluid & easier maintenance.
• COOLERS & LINES — universal stacked-plate kits with fans.

Featured for 1st Gen

• ATS Heavy-Duty Torque Converter (Non-Lockup 518/727) — towing-friendly stall & durability.
• BD ProForce Converter (’88–’93 727/518) — efficient, furnace-brazed fins.
• ATS A618 Towing Valve Body (’90–’93) — progressive line-rise for firm, safe shifts.
• ATS Deep Aluminum Pan — extra capacity, drain plug, sensor port.
• G360 3rd Gear (30-Tooth) — OE-style manual trans hard part.
• South Bend SDD3250-5G Dual Disc (Getrag) — street/tow holding power.
• Zumbrota NP241D Reman Transfer Case — 23-spline case for ’88–’93 W-series.

Why Buy from CPP Diesel

• First-Gen Focus: Parts and tech help specific to 1989–1993 drivetrains.
• Trusted Brands: ATS, BD Diesel, South Bend, Valair, Zumbrota, ARP, PPE & more.
• Expert Support: Converter stall selection, clutch capacity, cooler sizing, and G360 rebuild guidance.
• Fast Shipping: Popular converters, valve bodies, pans, clutches and cases ship quickly from U.S. warehouses.

Explore the full 1989–1993 Cummins catalog for complementary upgrades.

Helpful Notes

• Auto IDs: Early trucks use 727; late ’91.5–’93 use A518 (A618). Match parts to your build date.
• Fluid temps: Add an auxiliary cooler and gauge when towing or tuned—heat kills autos.
• Clutch selection: For manuals, size clutch to torque, use proper break-in, and inspect linkage/hydraulics.
• Transfer case: Most W-series run NP241D; verify input spline count and speedo setup before ordering.

Frequently Asked Questions

What converter works best for towing with a non-lockup 727/518?

Pick a heavy-duty converter with a modest stall and furnace-brazed fins, such as the BD ProForce or ATS Heavy-Duty.

How do I firm up shifts on an A518 (A618)?

A performance valve body like the ATS Towing VB or BD 1030410 improves line-rise and clutch apply.

What are common Getrag G360 wear items?

Synchronizers, bearings, forks and select gears (e.g., 3rd gear). Use quality rebuild kits and correct fluid.

Which transfer case fits my W250/W350?

Many 4×4 First-Gens use an NP241D. Verify input spline count and speedometer setup.

Do I need a deep pan and cooler?

They help keep ATF cool and extend service intervals. See the ATS Deep Pan and ATS Fan-Cooler Kit, then add a trans temp gauge.