blown front diff...

Petemcc · Post by **Petemcc** » Fri Feb 24, 2006 2:27 pm

am pritty sure i blew my front diff last night at the waimak went up a big hill bit of a bang, grinding noises and alot of cursing... put in 2wd and drove home with no noises (has ADD, not sure how this affects it, where does it dissengage ect) jacked up today and will be fully open, one wheel spinning and other not,, then will lock and both spin then spin as should - one in each direction - and then back to start, my thoughts f*&%ed, do i sound right???

what are my options??? if replacing will all surf difs fit? or are old ones different, and when i replace is there anyway of strengthening it - broke with 31's so new 33's wont help.

and yes i would love to put a solid dif in the front but unles it can be done for a grand..... then im shit out of luck

cheers Pete

Post by **mike** » Fri Feb 24, 2006 2:38 pm

The 7.5 diffs are weak. I just went through the same drama as you. What I did is get a diff from a wrecker(450+gst) but i was in a hurry. hunt around people have these(and throw them away GRRRrrrr) on trademe someone picked one up for a hundred and eighty bucks. Definitly put a locker in the front. it will strengthen it buy stopping one side spin up and then shockloading it when the wheel hits the ground again. Youll also drive alot slower over obstacles and up hills just because you can :wink:

I had 8 teeth gone from mine! so order your locker now http://www.rocky-road.com for a front 7.5" toyota IFS one. And start the hunt for your front diff. Putting a locker in will transfer the breakages to the CVs(just dont power on full lock) and CVS are cheaper and easier to fix.

Mike

Post by **mike** » Fri Feb 24, 2006 2:51 pm

oh and pete update your email address it keeps bouncing email

Mike

krawlr · Post by **krawlr** » Fri Feb 24, 2006 3:37 pm

where do you live petemcc?

SupraLux · Post by **SupraLux** » Fri Feb 24, 2006 8:58 pm

Pete, a SAS will not cost $1000, even if you do it yourself

Happy to take that as a deposit and time payments tho :lol:

Seriously tho, the IFS diff is a weak, but I ca't make head or tail of what you wrote.... sounds like the following:

Jacked truck up, then spun each wheel. One would spin, but the other wouldn't.

Put it in 4WD, then when one wheel was spun, the other spun in the opposite direction

If thats the case, then the truck is fine... open diffs do that, and the ADD simply locks one wheel to the other (through the diff)... although in 2WD you should still be able to spin one wheel... unless it was in gear and in 4WD...

Give me a call on 021 637 600. I don't have any 7.5" diffs left, but it sounds like that may not be the problem. Are you up here in Chch at the mo?

Steve

JTop · Post by **JTop** » Fri Feb 24, 2006 9:07 pm

The other thing the front locker does is give you a more ridgid carrier, this helps stop the C/W flexing away from the pinion.
J Top

jarps · Post by **jarps** » Sat Feb 25, 2006 9:02 am

there was a diff on trade me the other day, starting bid was $400. Has a locker and superwinch manual hubs. I picked up one for my surf off trade me for $180 just before xmas as blew mine aswell

jarps · Post by **jarps** » Sat Feb 25, 2006 9:05 am

thats $190

wjw · Post by **wjw** » Sun Feb 26, 2006 5:34 pm

jarps wrote:there was a diff on trade me the other day, starting bid was $400. Has a locker and superwinch manual hubs. I picked up one for my surf off trade me for $180 just before xmas as blew mine aswell

Sold I'm afraid, it was a 4pinion for a 8" diff. Guy in Kaipoi should be collecting it off me tomorrow...

Petemcc · Post by **Petemcc** » Sun Feb 26, 2006 5:46 pm

hey guys thanks for all the advice, been away 4 the weekend so havnt been online. supralux all the symtoms were jacked up in 4wd
one wheel would spin on its own then would jam up and would spin as it should, like it was missing afew teeth. will explan when i pic up body lift kit but im sure there is something wrong...

cheers pete

Petemcc · Post by **Petemcc** » Sun Feb 26, 2006 6:16 pm

mike emial updated

krawlr i live in chch

krawlr · Post by **krawlr** » Mon Feb 27, 2006 7:59 am

hi pete get me youre axle code from youre firewall and il get you a price inlc freight to youre door .

sooner the better mate. :wink:

Petemcc · Post by **Petemcc** » Mon Feb 27, 2006 8:06 am

trans/axel code is r150f g285

Post by **mike** » Mon Feb 27, 2006 8:13 am

limited slip I see. ordered that locker yet? if you dont it will just happen again guaranteed :wink:

Mike

Petemcc · Post by **Petemcc** » Mon Feb 27, 2006 8:16 am

im getting there lol just have to move some funds round.... i take it all the prices on website are american, whats the exchange rate like at the moment?

Post by **mike** » Mon Feb 27, 2006 8:17 am

yeah they are. exchange is pretty good. but dropping so the longer you leave it.

Mike

Petemcc · Post by **Petemcc** » Mon Feb 27, 2006 8:24 am

haha yea i get the idea will sort it out 2nite,

Petemcc · Post by **Petemcc** » Mon Feb 27, 2006 3:00 pm

how does the add work?? will it be ok if i drive it in 2wd, is the diff still spinning?? ie wouldnt want front wheels to lock up while driving around cos of bits of diff floating arround in there and jamming it up.

Post by **mike** » Mon Feb 27, 2006 3:16 pm

nope it works fine with the difflock and in fact is much better than only having freewheeling hubs except for long trips. All that it means now is the diff is locked and the right hand drive shaft still turns as per normal all the time but it drives the whole diff and turns the prop shaft to the transfer case. so you are turning more stuff but the benifit is when your offroad and you deselect 4wd the front two wheels are not locked togeather as you have split the left hand drive shaft giving you normal steering. but when you have free wheeling hubs and no add to achieve the same result you would have to get out and undo one hub!

To overcome the long distance driving problem (not having the front diff turn) i just got another drive flange for the right hand side and machined the spline out so the wheel freely rotates. the left drive shaft is split when disengaged 4wd and the right has no spline so the wheel cant turn the drive shaft. takes 5 mins to swap over. Or you could just get some free wheeling hubs.

Mike

SupraLux · Post by **SupraLux** » Mon Feb 27, 2006 3:26 pm

Yes, the diff is still partly spinning. Have a look here for a better idea of how ADD works:
http://www.off-road.com/toyota/tech/add/index.htm

And how to over-ride it:
http://www.4x4wire.com/toyota/tech/add/

I am pretty sure you can just remove the cap/hub from the permanent side wheel to let it free-wheel although it will allow dirt/moisture into the hub... have you found a diff?

Steve

Petemcc · Post by **Petemcc** » Mon Feb 27, 2006 3:43 pm

na havnt got a diff yet. how do i find out what exactly is wrong with it?? if all is working fine then when in 4wd and in gear and you spin one wheel the other should go in the other direction souldnt it, cos it doesnt doesnt do that all the time, only on occasion... could it be anything elce? will probably start pulling it apart on the weekend.

Pete

Petemcc · Post by **Petemcc** » Mon Feb 27, 2006 3:58 pm

i have a set of maual hubs i bought 4 my old surf in the garage... would it be easy to put these on it so that i can drive it round?

Post by **mike** » Mon Feb 27, 2006 4:06 pm

oh oops i thought you were talking about when you had a locker in there and you drive it around in 2wd.

Just take the right side drive flange off and either put a free wheeling hub on there if it will fit or get the hole machined out in the drive flange so it clears the spline on the drive shaft. either way you will need something for long trips if you decide to put a locker in there. I just machine d mine out and bought another one for 20 bucks from ace 4wd in chch which i swap over when i go on a trip.

your right drive shaft is permantly connected and when add disengages the left shaf is split and the right keeps spinning but only the spider gears. Mine stil managed to get shit up in there and would sometimes catch and jolt while driving back from where i blew the diff.

Petemcc · Post by **Petemcc** » Tue Feb 28, 2006 9:58 pm

had a yarn to a guy in the know tonight and he reckind it was the diff. gave the truck a gud water blast today gona start takin it apart 2moro arvo, still tryin to find a diff... got afew on trade me bt none in chch will c what hapns. cheers for the help guys.sorry bout all the qtions bt still have alot to lean about trucks, tho im getting there.

cheers Pete