What this gasket actually does
The oil cooler on these engines sits right up against the block, and the housing gasket is what keeps the coolant jacket sealed off from the oil galleries. When these fail you get coolant in the oil, oil in the coolant, or just a slow weep out of the housing that fools guys into thinking it's a rear main or front cover leak.
3104232 is Cummins' number for that specific gasket set on ISX and QSX blocks — it's not a generic flat gasket, it's cut to match the coolant passages and oil bores on that housing casting, so a wrong gasket either restricts flow or leaks around a passage that isn't lined up right.
This is a maintenance item as much as a repair part — a lot of shops replace it any time the oil cooler housing comes off for cleaning or a cooler swap, since reusing the old gasket after it's been compressed once is asking for a comeback.
Why all these numbers cross
Cummins has revised this gasket a few times over the ISX/QSX production run — different plant sourcing, minor material changes — so you'll see 4089102, 4089197, 4973532, and 4376196 all showing up as Cummins part numbers for what's functionally the same gasket. Aftermarket suppliers cross it under B32477, 3680712, 3682789, 3689755, and 4955592 depending on who packaged it.
The reason these interchange is the housing casting and bore pattern didn't change even when Cummins updated the material spec or added it to a kit — the gasket footprint is identical across those numbers. Where guys get burned is grabbing a gasket for a similar-looking Cummins housing off a different engine family; the bolt pattern might line up close enough to bolt down and still leak because a coolant passage is a hair off.
Surest way to confirm before you order: pull the number stamped or printed on the old gasket, or check the number Cummins lists for your engine's oil cooler housing on the parts plate/build sheet. If that number isn't in our cross list, call us with the engine serial and we'll check it against QSX/ISX/ISX HQ applications before you buy.
Ordering from PartStop
We stock 3104232 here in Tacoma and it typically ships same day if you order before cutoff — no waiting on a dealer backorder to get a truck back on the road. We ship nationwide too, so this isn't a Tacoma-only deal.
At $104.99 it's not the cheapest gasket in the shop, but it's a fit-critical seal on an expensive engine — not the spot to save ten bucks on a mystery cross-reference part.
This one carries our standard 6+ month warranty. If it doesn't seat right or you've got a fitment question after the housing's apart, call the counter before you force it — easier to sort out before torque than after.
3104232 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 3104232. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Cross-Reference | B32477, 3680712, 3682789, 3689755, 4955592 |
| Cummins | 4089102, 4089197, 4973532, 4376196 |
Frequently asked questions
Does 3104232 fit my ISX?
It fits ISX, ISX HQ, and QSX applications, but Cummins has run a few gasket revisions across those engine families. Pull your engine serial number and check the oil cooler housing gasket callout on your parts book or the number off the old gasket — give us a call with that info and we'll confirm before you order.
Is 3104232 the same as Cummins 4089102?
Yes, 4089102 is one of the Cummins numbers that crosses to this gasket — same housing fitment, just a different point-in-time part number from Cummins. Functionally they're the same seal for this application.
Can I reuse the old gasket if it looks fine?
Not recommended. Once these gaskets get compressed and heat-cycled they lose their seal, even if they look intact. Any time the oil cooler housing comes off, replace the gasket — it's cheap insurance against a coolant/oil cross-contamination job.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.