Replacement Bearings and Seals for 2007 Montana 3700RL

Updated 02/19/2026 | Published 02/14/2026

Products Featured in This Question

Timken Bearing Kit 15123/ 25580 Bearings, 15245/25520 Races, 412920 Seal

(271)

$127.30

Bearing Kit, 15123/ 25580 Bearings, 10-36 Seal

(3384)

$29.94

Bearing Kit, 15123/25580 Bearings, GS-2125DL Seal

(3384)

$35.52

Timken Bearing Kit, 15123/25580 Bearings, 15245/25520 Races, 413470 Seal

(271)

$121.93

Question:

Good morning, I have a 2007 Montana 3700RL that I recently acquired and need to know the bearings and seals for my axles. The vin number is 4YDF3402X74700425 with 6K axles. If you can point me in the right direction I would be appreciative.

asked by: Braxton R

Expert Reply:

Hey Braxton! Since you have 6k axles I can tell you you either need Bearing Kit # BK3-100 (2.25" inner diameter grease seal) or # BK3-110 (2.125" ID grease seal). For the Timken you looked at it is either the # TMK42VR (2.25") or # TMK82VR (2.125").

I don't have a way to look this up using your VIN, but if you can give me the manufacturer and serial number off of your axle tag I can verify the right grease seal size. You could also pull the hubs and measure.

expert reply by: Robin H