bw-1372/-4472 borg warner transfer case

 Installation Tips & Fitment Advice

Installing or replacing the bw-1372/-4472 borg warner transfer case isn’t extremely difficult for a seasoned mechanic or capable DIYer, but here are some specific tips that can save time and prevent mistakes:

 Match Spline Count

• Rear output shaft spline count is typically 27 splines, but verify before buying replacement driveshafts or couplers.

• Incorrect spline matching is a common install issue when parts are sourced from junkyards or online sellers.

 Seal All Surfaces

• Apply a thin film of Permatex RTV or equivalent on mating surfaces (especially if reusing the original case halves).

• Avoid over-tightening bolts on the aluminum case to prevent warping or cracking.

 Refill With Proper Fluid

• Use Dexron III/Mercon ATF (or updated Dexron VI if compatible).

• Overfilling or underfilling is a frequent error—check fill level at the inspection plug.

 Don’t Forget to Flush Cooler Lines

• If the unit is connected to a trans oil cooler (as on some AWD models), ensure those lines are flushed before reconnecting to avoid contaminating a fresh rebuild.

 Common Failure Points On bw-1372/-4472 borg warner transfer case

Despite its simplicity, the bw-1372/-4472 borg warner transfer case has a few well‑known weaknesses. If you’re considering buying a used one or are experiencing drivability issues, here are symptoms and causes to watch out for:

Stretched Chain

• Symptom: Slipping under load, especially in wet or snow conditions.

• Diagnosis: Excessive play or noise when shifting from park to drive.

• Fix: Replace the chain (commonly included in rebuild kits).

Viscous Coupler Failure

• Symptom: Poor AWD performance, binding during turns, or overheating.

• The viscous clutch can leak silicone fluid or lock up.

• Some owners replace the coupler with an aftermarket mechanical differential or swap in a full-time 4WD case instead.

Case Wear / Cracking

• A known issue is wear on the aluminum case half where the chain slaps the inside of the housing.

• This happens if the chain is loose and running under high torque loads for too long.

• Tip: Inspect the case interior for grooving or metal shavings during a rebuild.

Leaking Seals

• Most common on the rear output shaft. Once seals dry out or harden, ATF will leak down the driveshaft and could affect U-joints or center bearings.

• Replace with a complete seal kit if you’re rebuilding.

 Upgrade & Modification Potential

Although the bw-1372/-4472 borg warner transfer case is not a rock crawler’s favorite, there are some potential upgrades and modifications depending on your use case:

Replace with NP231 or NP233 (Selectable 4WD)

• Off-roaders sometimes swap the 4472 for an NP231 or NP233 transfer case with selectable 2WD/4WD capability.

• This involves adapting the output shafts, driveshaft lengths, and shift linkages, but it allows greater control over torque delivery.

Performance Driveshafts / Slip Yoke Eliminators

• For vehicles like the GMC Syclone or Typhoon, upgraded performance driveshafts with solid u-joints and balanced output can reduce vibration.

• While SYE (slip yoke eliminators) aren’t common for the 4472, custom shops may offer machined tailhousings or yokes.

Synthetic ATF

• Running a high-quality synthetic ATF (like Amsoil or Redline) can extend the life of the viscous coupler and internal clutches.

 Availability, Sourcing, and Shipping

New-Old Stock (NOS)

• Some vendors still carry new rear case halves for the bw-1372/-4472 borg warner transfer case, often manufactured decades ago but stored properly.

• These can command high prices ($150–$250 USD) but are a good alternative to welding or repairing a worn-out case.

Used from Donor Vehicles

• Common donor vehicles include:

  • Chevy Astro / GMC Safari AWD (1990–1998)

  • Oldsmobile Bravada (1991–1997)

  • GMC Typhoon / Syclone (performance AWD)

  • Chevrolet S10 Blazer AWD (specific trims)

• Junkyards or salvage yards may offer these cases for as low as $100–$300, but condition varies.

International Shipping Tips 

• Due to weight (~70–85 lbs / 32–38 kg), international shipping can be expensive.

• Tip: Buy parts only (gasket kits, input shafts, chains) from US sellers on eBay or RockAuto that offer consolidated shipping.

• For full cases, consider using freight forwarding services (like MyUS, Shipito, or Stackry) to reduce total cost.

 Who Should Buy the bw-1372/-4472 borg warner transfer case?

This bw-1372/-4472 borg warner transfer case is ideal for:

• AWD van and SUV owners: Especially if you own a 1990s GM vehicle and need a direct, bolt-in replacement.

• Restorers of Syclone/Typhoon: The BW-4472 was original equipment and matches factory specs.

• Performance enthusiasts: Wanting to retain AWD torque delivery in a 4.3L GM-powered vehicle.

• Mechanics or shops: Rebuilding these units is fairly simple with parts widely available and markups strong on resale.

 Tips for Listing a bw-1372/-4472 borg warner transfer case for Sale (if you’re selling)

If you’re writing a product listing, use the following format to help your ad stand out:

Price Suggestion:

• Used, working unit: $250–$400

• Fully rebuilt with warranty: $600–$800

• Core or parts only: $100–$200 depending on condition

 Final Thoughts

The bw-1372/-4472 borg warner transfer case is a sturdy, chain-driven AWD transfer case that served millions of GM vehicles reliably through the 1990s. While it lacks low-range gearing or selectable 4WD, it provides simple, always-on all-wheel drive through a viscous coupler and planetary gears.

Rebuild kits are affordable and readily available, and the case itself is well-documented. Whether you’re replacing a failed unit or restoring a vintage performance SUV, this transfer case remains a smart, reliable option.bw-1372/-4472 borg warner transfer case