1970 FJ40 diff question

3pointsmach · 05-01-2009, 08:11 AM

I have a stock '70 FJ40 that has self-destructed the rear diff., and need to look for a replacement. Are the front and rear diff's the same, and interchangeable? The look the same externally.

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FlyingLow · 05-06-2009, 04:51 PM

Yup they are the same. Fronts are generally better because they are less used but sometimes guys want more money for them. Make sure you get the right ratio. The 410 has some numbers stamped on the outside of the ring gear that calculate out to 410, the 377 has nothing on it. Ones thicker ring gear but I can't remember which. You will most likely need a 410 but check what you have before you buy a new one. Good luck.

3pointsmach · 05-08-2009, 08:08 AM

Thanks for the info. Found one, bought it, installed it. On the road again----.

05-06-2009, 04:51 PM	#2 (permalink)
FlyingLow Registered User Join Date: Jul 2007 Location: Van Island BC Posts: 93	Yup they are the same. Fronts are generally better because they are less used but sometimes guys want more money for them. Make sure you get the right ratio. The 410 has some numbers stamped on the outside of the ring gear that calculate out to 410, the 377 has nothing on it. Ones thicker ring gear but I can't remember which. You will most likely need a 410 but check what you have before you buy a new one. Good luck. __________________ 77 FJ40 36 TSLs, 45 springs in rear, 8274, ARB rear, TBI 2F 97 4 Runner Ltd TLCA# 9203

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05-08-2009, 08:08 AM	#3 (permalink)
3pointsmach Registered User Join Date: May 2009 Posts: 2	Thanks for the info. Found one, bought it, installed it. On the road again----.