Tranny swap

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Tranny swap

Unread postby Rparker762 » Mon Dec 01, 2003 4:53 pm

Tossing around the idea of swapping a manual tranny in the Blazer, and thoughts? Any ideas on feasablilty of it?
1984 Chevy Blazer, 350, 700r4, NP208, 35x12.50 15s with the stock 3.73 gears.
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Unread postby jpeteK30 » Mon Dec 01, 2003 5:01 pm

did it in my work truck recently(2wd) pretty straightforward, if you have a donor truck for all the linkage and pedals. i'm pretty sure the input shafts are different for the t-case also :scratching: without a donor truck, locating all the parts may be a real pain in the ass...
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Unread postby Tice » Mon Dec 01, 2003 5:12 pm

Any thing that you don't get off a donor you can get at the Chevy dealer. You'll have to get a t-case that is for a manual also.
I don't need a winch, I wheel a Toyota!!!!

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Unread postby Rparker762 » Mon Dec 01, 2003 5:34 pm

I can probably get everthing but I really dont think I can tackle somethin that big. I did swap my broother-in-laws Clark 4 speed OD on his Bronco for a Hughes C6 but I dont think I can go the opposite.. :scratching:


Ron
1984 Chevy Blazer, 350, 700r4, NP208, 35x12.50 15s with the stock 3.73 gears.
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Unread postby Tice » Mon Dec 01, 2003 5:44 pm

Rparker762 wrote:I can probably get everthing but I really dont think I can tackle somethin that big. I did swap my broother-in-laws Clark 4 speed OD on his Bronco for a Hughes C6 but I dont think I can go the opposite.. :scratching:


Ron



The hardest part is getting the clutch/brake pedal assembly in( pull the sterring column out). The frame even has holes in it already for the brackets for the clutch linkage.
I don't need a winch, I wheel a Toyota!!!!

I'm a firm believer in the double standard!!!!!!!!

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damn...well new or next husband i dont care just find one so i can get off the hook already
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Re: Tranny swap

Unread postby FredTJ » Wed Dec 03, 2003 2:37 pm

Rparker762 wrote:Tossing around the idea of swapping a manual tranny in the Blazer, and thoughts? Any ideas on feasablilty of it?


Mmmmm, why would you want to do that.
Virtually everyone else, who wheels in the rocks, and has a manual tranny, is swapping to the auto...
Muuuuuuuuccccccccccchhhhhhhh better rockcrawling.



:)
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Unread postby Rparker762 » Wed Dec 03, 2003 4:41 pm

Umm, 7.06 1st gear. Plus it makes me feel like I'm drivin a big sports car



Ron
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Unread postby FredTJ » Wed Dec 03, 2003 6:04 pm

Ummmm, the torque converter on the auto tranny supplies a, virtually, infinitely variable 1st gear, assuming that you have the correct stall speed for your engine (which you may not. I've seen a handful of V-8 rigs, on the trail, that had too low of a stall speed converter)..

With an auto (and a correct torque converter), you should not even care what "ratio" your 1st gear is.

I swapped an auto in about 18 months ago.
I went from a 5 speed (with a considerability lower 1st gear), and a 4:1 transfer case (low range), to the auto and stock gearing in the transfer case (low range), and I have a *ton* better "crawl ratio" now.
I can, literally, sit on a rock face that's so steep, that my tires are right at their adheasion limit, and not move at all. If I want to go forward I just lightly apply a little gas.
You have a *ton* more control with an auto.
You can develope a burst of tire speed if you have to (say, to prevent going over if you've misjudged an off camber spot), with a simply press of the gas pedal.
With a manual tranny, it's very, very difficult to do that.
Since there isn't a "variable ratio 1st gear" with a manual tranny, you have have a low ratio 1st gear, a low ratio xfer case, and low ratio diffs, if you expect to rock crawl (which is pretty much all we have out here), with any success. That combo creates some real interesting moments, when some wheel speed is needed all of the sudden.

If you don't have the ability to creep along at much slower than walking pace now (when in low range), I'ld suggest you look at another torque converter, or else find out what's wrong elsewhere.


:)
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- '98 Sahara, 4.0L 6 cyl, Auto (swap from 5 sp)
- 4.0" Procomp Springs + 1 1/4" JKS body lift.
Rear tri-link, and Currie J arms.
- Dana30/Dana44 (rear disk conversion); locked F/R; 4.56.
- 35x12.50 MT/R's sipped on 15x7 Champion Beadlocks.
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Unread postby Rparker762 » Wed Dec 03, 2003 6:20 pm

Well, the torqe converter in a stock one for a TH350, not sure what the stall speed is. And my tranny does have issues. Well I dont know what to look for in a torqe converter. Any suggestions?
1984 Chevy Blazer, 350, 700r4, NP208, 35x12.50 15s with the stock 3.73 gears.
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Unread postby Jeepnut67 » Wed Dec 03, 2003 6:39 pm

I'm with Fred on this topic.. I wheeled with a relatively high 33-1 crawl ratio in my CJ, and a 25-1 in my fathers CJ, and even ridden in a CJ with a 185-1 crawl ratio and a few vehicles with automatics. The only time I really dont like the auto is when decending a REALLY steep downhill where you really want to go slow. The one disadvantage I REALLY dont like with the 185-1 crawl ratio is the same thing Fred touches on... wheel speed when you need it suddenly. I now have an auto in my CJ that I am still working on and am really looking for that infinate crawl ratio that goes to a 35-1 when I step on the gas.

One reason I could see going standard over automatic is if you have one of the POS 700R4's or 4L60E trannys in the newer GM trucks. My father has replced his 5-6 times in 230,000 miles on his 92 pickup. But a TH400 might work a lot better if you dont need/want the OD.
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Unread postby whiteyz » Wed Dec 03, 2003 6:48 pm

Damn 5-6 times for 230000 miles. My 96 has original 4l60e after 135000 never a problem with it even with 33s and the original 10 bolt with the g80 posi. Guess Im getting lucky then. Not that Im easy with the truck either.
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Unread postby Tice » Wed Dec 03, 2003 6:49 pm

You guys have good pionts but for me I'll never go auto agian. Thats just me. :cool:
I don't need a winch, I wheel a Toyota!!!!

I'm a firm believer in the double standard!!!!!!!!

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damn...well new or next husband i dont care just find one so i can get off the hook already
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Unread postby 4alarm » Wed Dec 03, 2003 7:00 pm

Maybe if I went auto they'ed quit calling me "STALL"! :naughty:
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Unread postby Rparker762 » Wed Dec 03, 2003 7:26 pm

So what should I look for in the way of a torque converter :scratching:


HELP! :bow2:


Ron
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Unread postby Jeepnut67 » Wed Dec 03, 2003 7:45 pm

whiteyz wrote:Damn 5-6 times for 230000 miles. My 96 has original 4l60e after 135000 never a problem with it even with 33s and the original 10 bolt with the g80 posi. Guess Im getting lucky then. Not that Im easy with the truck either.


How many trailers do you tow with it????? :p :scratching:
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Unread postby whiteyz » Wed Dec 03, 2003 8:27 pm

I tow my car hauler with a full weight bomber car on it quite frequently. :flipoff: Car hauler with minivan cause the damn ford engineers couldnt build a real motor all the way from woods canyon lake to here. :p
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Unread postby jpeteK30 » Wed Dec 03, 2003 9:43 pm

700R4 has the lowest 1st gear ratio of ANY auto tranny ever produced by GM. awesome, bulletproof trannys if built properly. essentially a better, newer version of a TH400, with a 4th gear and a lockup converter. from the factory, they are garbage, this i will not argue. i have one in my 90 C1500, and have had no problems since i had it rebuilt with quality parts and a vette servo. probably one of the best trannys ever built in my humble opinion. :cool:

that said, i like an auto tranny for wheelin. gives you a little cushion, should you really bind up. also, size 12 boots aren't worth a shit for doing the heel/toe thing :D
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Unread postby Erich » Wed Dec 03, 2003 11:30 pm

I was an automatic guy for years, and I don't plan on going back. It's a lazy way to do it, and does make SOME things easier, but I think they have way too many downfalls for me.

I don't like the idea of losing power just because you are sitting verticle and the pump can't get fluid, and I'm not about to spend the big $$ on an accumulator. I don't like the lack of engine braking, I HATE ATF, and I just feel like they are really weak, expensive link. On a stick, if you smoke a clutch, you can usually limp it out, or at the worst, swap one out on the trail. If you smoke the clutches in an auto, you are screwed. Auto's are prone to heating up, especially when using the 'unlimited 1st gear' slipping method prior to lockup. Not only is tough on the tranny, but can actually raise engine temps if the cooler runs in or in front of the radiator. Granted, you need a bit higher crawl ratio for a stick, but you also often have a wider variety of gears to choose from (5 instead of 3). Last but not least is the cost to repair or replace one. Replacing my tranny in the toy is a WHOLE lot cheaper than the 700R4 in the blazer.
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Unread postby Rparker762 » Thu Dec 04, 2003 5:21 pm

The voices! VOICES!! They say so much so now they keep talking and messing with my MIND!!!!!


Great guys, thanx, now I'm even more screwed up than when I started! :p No really I can get a SM420 and the linkage from a guy who is wanting to swap to an auto so we're talkin about a straight swap.

What chall think?


"Confused in Hell" :wtf: :D :D
1984 Chevy Blazer, 350, 700r4, NP208, 35x12.50 15s with the stock 3.73 gears.
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Unread postby crew 75 cab » Thu Dec 04, 2003 10:28 pm

HI I had to put my two cents in on this topic, I work in a tranny shop and think the standard would be a lot more forgiving than the auto and the 700R4 is very loosely based on the TH350 not TH400 like posted earlier, 4L80E is based on the TH400, The 4L80E would be a good choice but expensive due to the computer controls to run it, 700R4's are poor due to the major need for cooling the way the clutch packs are configured internaly creates a large heat sink of sorts. I personaly think the TH400 is the best all around trans in the automatic world. I have some extra clutch conversion parts and some pretty good know how on Chevy's. I also have a SM465 with the 400 output that came out of a 83 suburban.
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Unread postby TROGDOR » Wed Dec 10, 2003 5:41 pm

what shop do you work at? I'm gonna need some work done on a 400 soon
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Unread postby crew 75 cab » Thu Dec 11, 2003 9:21 pm

Call me at 584-0504,I need some tube work. P.S. I met you at shitcreek a while ago when the guy got his ford powerstroke with 40" tires stuck.
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