Swaping Rings and Pinions

BJ40 3B · 05-19-05, 06:04 PM

Hey guys,

I have a BJ40 with original 4.11 diffs, and on next week i will install some 9.00x16 tires (actually they are 92cm in diameter). Would it be better to regear it to 4.56 ?
My REAL question is if it's possible to swap the ring and pinions from a BJ73 but keeping the original BJ40 carrier. Or do i need also the BJ73 carriers? The BJ73 rear axle has an LSD in the rear and 4,56 diff ratio from factory...

Any help would be very helpfull.

Regards

tlcruiserman · 05-19-05, 06:23 PM

The ring and pinion should be the same as long as the Bj40 is from 74' on (spline count on the flange was different on earlier models of 40 series). Carriers would also be interchangable as long as you do not have factory cable lockers in your Bj73.

Cheers,

Michael

crushers · 05-19-05, 07:11 PM

actually if you have a semi floater rear on the 40 series then the LSD will not fit, well it will fit but you will not be able to put the C clips in... thus in reality it will not fit.
the front will
the rear from the 73 will fit into the rear of the 40 FF or SF...
4.56 fromt he factory... wow, i have not come across that on any trucks i have had... i know that on the mine trucks you could get factory 4.56

cheers

NZBJ71 · 05-19-05, 07:50 PM

Small hijack here, Question for wayne

I have a lockrite in my bj71 that I am about to get rid of (replacing with a KZJ71) Will the the lockright fit a BJ4? (Flat deck) that my father has as a farm vehicle? They are both semi floaters.

Cheers

crushers · 05-19-05, 07:51 PM

what year are the 2 vehicles?

tlcruiserman · 05-20-05, 01:42 AM

Quote:

Originally Posted by crushers

actually if you have a semi floater rear on the 40 series then the LSD will not fit, well it will fit but you will not be able to put the C clips in... thus in reality it will not fit.
the front will
the rear from the 73 will fit into the rear of the 40 FF or SF...
4.56 fromt he factory... wow, i have not come across that on any trucks i have had... i know that on the mine trucks you could get factory 4.56

cheers

Wayne is correct I missed the part about the LSD..Sorry...my bad

Michael

05-19-05, 06:04 PM	#1
BJ40 3B IH8MUD Junior Join Date: Aug 2003 Posts: 87	Swaping Rings and Pinions Hey guys, I have a BJ40 with original 4.11 diffs, and on next week i will install some 9.00x16 tires (actually they are 92cm in diameter). Would it be better to regear it to 4.56 ? My REAL question is if it's possible to swap the ring and pinions from a BJ73 but keeping the original BJ40 carrier. Or do i need also the BJ73 carriers? The BJ73 rear axle has an LSD in the rear and 4,56 diff ratio from factory... Any help would be very helpfull. Regards

05-19-05, 06:23 PM	#2
tlcruiserman IH8MUD Lifer Join Date: Jun 2004 Location: San Diego, CA USA TLCA# 7932 Posts: 1,078	The ring and pinion should be the same as long as the Bj40 is from 74' on (spline count on the flange was different on earlier models of 40 series). Carriers would also be interchangable as long as you do not have factory cable lockers in your Bj73. Cheers, Michael __________________ Michael tlcruiserman@westcoastcruisers.com West Coast Cruisers Incorporated

05-19-05, 07:11 PM	#3
crushers IH8MUD Lifer Join Date: Feb 2004 Posts: 9,793	actually if you have a semi floater rear on the 40 series then the LSD will not fit, well it will fit but you will not be able to put the C clips in... thus in reality it will not fit. the front will the rear from the 73 will fit into the rear of the 40 FF or SF... 4.56 fromt he factory... wow, i have not come across that on any trucks i have had... i know that on the mine trucks you could get factory 4.56 cheers __________________ pulling this info out of my ass so take it with a pound of salt "People are poor because they don't spend money wisely, tough sh!t !!! " John Galt 09/22/08 "educate yourself. Sorry if that seems too blunt." John Galt 11-01-08 Wayne in Ontario http://www.ivoac.ca join today

05-19-05, 07:51 PM	#5
crushers IH8MUD Lifer Join Date: Feb 2004 Posts: 9,793	what year are the 2 vehicles? __________________ pulling this info out of my ass so take it with a pound of salt "People are poor because they don't spend money wisely, tough sh!t !!! " John Galt 09/22/08 "educate yourself. Sorry if that seems too blunt." John Galt 11-01-08 Wayne in Ontario http://www.ivoac.ca join today

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05-19-05, 07:50 PM	#4
NZBJ71 IH8MUD Rookie Join Date: Mar 2004 Location: Dunedin, New Zealand Posts: 44	Small hijack here, Question for wayne I have a lockrite in my bj71 that I am about to get rid of (replacing with a KZJ71) Will the the lockright fit a BJ4? (Flat deck) that my father has as a farm vehicle? They are both semi floaters. Cheers