Do I have an LSD diff?

Post by **shortgq** » Tue Jun 22, 2004 5:07 pm

Hi, i have recently bought a SWB Ford Maverick January 1990 XLT Petrol. Just wondering would this model have an LSD or not??

Post by **Daisy** » Tue Jun 22, 2004 5:17 pm

one of the boys on this forum knows the compliance plate numbers to identify an LSD on ya particular model - search maybe?

Other way of doin it is...

Jack up the diff - jack under pumpkin so that both wheels are raised slightly.

Rotate drivers wheel . and if the opposite wheel rotates in the same direction - you have LSD, If it rotates the opposite direction, then you have an open wheeler.

TOM

Post by **matthewK** » Tue Jun 22, 2004 5:52 pm

my is an 88 GQ ST and it has lsd

also another way to test it i think was 1 tyre on dirt and the other on road
or something like that was a while ago on the forum the same question was asked cant remember how long ago

maybe one of the other guys might know

Post by **RMP&O** » Wed Jun 23, 2004 12:35 am

to find out if I had an LSD I simply put the entire truck up on jacks. Started the SD33, put it into low 4wd, set the hand throttle at about 1000rpm's and then tried to hold the tires still while it ran. Could not stop either rear wheel by hand, front was easy to hold a tire still. Pretty fool proof and no danger to me or the truck if I made a mistake.

Post by **XterraGuy** » Wed Jun 23, 2004 1:31 am

GQ wrote:Jack up the diff - jack under pumpkin so that both wheels are raised slightly.
Rotate drivers wheel . and if the opposite wheel rotates in the same direction - you have LSD, If it rotates the opposite direction, then you have an open wheeler.

FYI, this only works in 2WD of course, but the transmission MUST be in neutral, otherwise if the driveshaft can't turn there's only one way for the rotation to make it across the diff, and that's through the side/spider gears which will make the other side rotate opposite, LSD or not. Of course, it will be much more difficult to turn if there's an LSD in there.

What you're testing is which is easier to overcome, the force needed for the large ring gear to turn the small pinion, or the force needed for the side gears to drive the relatively same-sized spider gears. In an open diff, the latter is far easier, but on a decently-tuned LSD, the clutch pack will hold the side gears tightly enough that it's easier for the entire carrier and ring gear to drive the pinion.

Brent

Post by **Wendle** » Wed Jun 23, 2004 7:14 am

it is a pretty up-spec truck you have bought. if it doesn't have the factory locker, it will undoubtedly have the LSD.

Post by **Rainbow Warrior** » Wed Jun 23, 2004 6:54 pm

shortgq wrote:Hi, i have recently bought a SWB Ford Maverick January 1990 XLT Petrol. Just wondering would this model have an LSD or not??

On smooth tar corner in 1st gear at about 1500rpm hook it tight around a corner and open up the secondaries and you'll hear the tyres start howling.

Warning don't try this with a diesel

Post by **mud_patrol** » Wed Jun 23, 2004 7:13 pm

That all sounds like fun...

But I'd just stick my head under and have a look.
Most LSD's are marked accordingly so people will use the right oil to service them.

Post by **beefie** » Wed Jun 23, 2004 7:41 pm

I thought xlt had rear diff lock as standard

Post by **shortgq** » Wed Jun 23, 2004 8:03 pm

How were the factory diff locks engaged??

Post by **Daisy** » Wed Jun 23, 2004 8:06 pm

shortgq wrote:How were the factory diff locks engaged??

vacuum acuted :?:

Post by **Dirty Dave** » Thu Jun 24, 2004 5:11 pm

How about hit some grass and if it lights up both and tight circles are comin on thick and fast she is all good (its a limo) if it lights one up then you haven't gassed it enough or no limo........the factory diff locks are air op wit the line coming into the back of the diff pumpkin - if so strengthen it so it doesn't break off...... :bad-words:

Post by **bj on roids** » Sat Jun 26, 2004 9:23 am

beefie wrote:I thought xlt had rear diff lock as standard

not all XLT's in fact dirty dave has one without the factory diff lock, but to him its not needed, he only wanted power windows and a sunroof :armsup:

Post by **robbie** » Sat Jun 26, 2004 9:52 am

Rainbow Warrior wrote:Warning don't try this with a diesel

why?

Post by **rumpig89** » Sat Jun 28, 2008 1:13 pm

robbie wrote:
Rainbow Warrior wrote:Warning don't try this with a diesel
why?

x2

Post by **chimpboy** » Sat Jun 28, 2008 5:17 pm

All Mavericks have LSD unless they have a diff lock. I have never seen a Mav with an open rear diff.

This doesn't apply to GQs though.

Post by **mattsluxtruck** » Sat Jun 28, 2008 9:25 pm

chimpboy wrote:All Mavericks have LSD unless they have a diff lock. I have never seen a Mav with an open rear diff.

This doesn't apply to GQs though.

Well mine had an open in it when I got it. 1990 DA Maverick X. Full poverty pack , vinyl floor , bench seat , drum rear and open centre.

They are out there!

Post by **macneil** » Sun Jun 29, 2008 12:29 am

rumpig89 wrote:
robbie wrote:
Rainbow Warrior wrote:Warning don't try this with a diesel
why?
x2

yeah why not..

Post by **cooki_monsta** » Mon Jun 30, 2008 4:03 pm

jump under your car and have a look for an orange LSD sticker on the pumpkin

Post by **cooki_monsta** » Mon Jun 30, 2008 4:03 pm

eat it and youll hallucinate

Post by **brad-chevlux** » Mon Jun 30, 2008 7:47 pm

Dirty Dave wrote:How about hit some grass and if it lights up both and tight circles are comin on thick and fast she is all good (its a limo) if it lights one up then you haven't gassed it enough or no limo........the factory diff locks are air op wit the line coming into the back of the diff pumpkin - if so strengthen it so it doesn't break off......

i know my LSD works well. the black mark on my driveway and ripped grass just next to it are proof of that. (one wheel on concrete the other on grass)

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