89 sr5 four wheel drive wont ingage. need help!! - Toyota Nation Forum : Toyota Car and Truck Forums


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Old 12-18-2011, 12:52 AM   #1 (permalink)
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Question 89 sr5 four wheel drive wont ingage. need help!!

hi my name is jason. i just bought a 1989 sr5 with the 3.0 and its a 5 speed with ex. cab. but anyway when i go to shift it into four high or four low nothing happens it just stays in 2wd. no grinding or anything. and im new to the toyota 4wd set up. so anyone know where i should start? i will be very greatful for any help.
thanks
jason
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Old 12-18-2011, 09:37 AM   #2 (permalink)
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Auto or manual locking hubs? Regardless, take em apart and grease them. Should do the trick. The hubs are the culprits way more often than the T-case,...and if it was the t-case, you'd probably hear some grinding. Dunno for sure though, have never seen a Toy with a t-case problem.
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Old 12-19-2011, 09:09 AM   #3 (permalink)
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My guess is there is a problem with the VSV or vacuum line that activates the 4WD.
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Old 12-19-2011, 11:51 AM   #4 (permalink)
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if it is a manual locking hub, did you ingage the hub first?
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Old 12-19-2011, 09:34 PM   #5 (permalink)
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An 89 should have the ADD system, which means no hubs, auto or manual.

randol154, when you shift into 4 LO do you feel the lower gearing? does the 4WD indicator on the dash light up?
If yes and no, the t-case is doing it's job and the problem is most likely in the somewhere in the vacuum circuit that locks the front axle, as TNRabbit suggested.
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84 4Runner rockcrawler - ARBed 5.29's, 36" TSLs, dual t-cases w/ 4.7 crawler gear, Chevys, 30 spline Marlins
83 p/u trail rig - Buick 231 V6, Weiand intake, Holley 4 bbl, TH-350 auto w/700R4 low gearset, dual tanks ...
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Old 12-19-2011, 11:46 PM   #6 (permalink)
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No clue if this applies (sure would be nice huh) but sb5walker said in the Massive Read This First post about his 3vze:

Sticky 4WD engagement - our transfer cases have a quirk where if you run it in 4wd on a surface with good traction (like a dry road or one that's just wet) the 4wd may later get balky at engaging. You can move the selector to 4 high or low, but it won't engage. The solution is to drive forwards and backwards repeatedly (on a slippery surface) until it engages. I've seen this take some time. The lesson is, make sure you run in 4wd only on slippery surfaces.

Massive truck info post: everyone must read before posting!
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Old 12-20-2011, 10:28 AM   #7 (permalink)
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An ADD system? What is it? Just wondering.
I've had an 89 with manual locking hubs... and had picked up an 88 with locking hubs also.
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Old 12-20-2011, 07:36 PM   #8 (permalink)
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We ended up fixing the OP's truck. As stated above it was a vacuum problem. Once the hoses swapped by the PO were fixed, the cruise control started working too, imagine that. Now to fix the cold start problem.

thanks to all for the advice.
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Old 12-20-2011, 09:29 PM   #9 (permalink)
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Quote:
Originally Posted by thctravel View Post
An ADD system? What is it? Just wondering.
I've had an 89 with manual locking hubs... and had picked up an 88 with locking hubs also.
It was a new 4WD system Toyota came out with starting in 89 trucks and 90 4runners IIRC.
Google it for more info.
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84 4Runner rockcrawler - ARBed 5.29's, 36" TSLs, dual t-cases w/ 4.7 crawler gear, Chevys, 30 spline Marlins
83 p/u trail rig - Buick 231 V6, Weiand intake, Holley 4 bbl, TH-350 auto w/700R4 low gearset, dual tanks ...
89 4Runner - stock
http://www.cardomain.com/id/fourwd1
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