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| What are the advantages of a getrag over a Muncie with a 3800sc swap (Page 2/3) |
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sardonyx247
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MAY 21, 07:14 AM
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| quote | Originally posted by Will:
Also, there are several versions of the Muncie: 3.32, 4.10, 3.65 and FrankenMuncie
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The 3.32 and the 4.10 only came in 84, and they are weak, no webbing on the case. They work fine with a duke.
On the V6 muncie the case is webbed and (IIRC) I think the gears are bigger, so is the diff. We were going to swap in a 4.10 gears once, opened both cases and decided that it would be a bad idea.
------------------
"DRIVE IT LIKE A FIERO"
'84 Fiero, engine to be determined '87 Duke (Sold)
'87 Quad 4 H.O.
'87Blue GT 3.4L Swap Completed!!!!!!!! Boosted!!!!!!!
^^^^ Now in the Construction Zone^^^^
Las Vegas Fiero Club Parts/Sales/Service/Club
Fiero Road Club Of Northern Nevada
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Will
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MAY 21, 07:51 AM
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| quote | Originally posted by PaulJK:
The prevailing opinion has Always been that the 4 speed muncie is stronger than the getrag, that's why West Coast Fieros always uses the muncie in their swaps. a few postings:
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And you know what they say about opinions 
I've had both apart, and there's no reason to think the Muncie is stronger.
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Will
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MAY 21, 07:55 AM
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| quote | Originally posted by sardonyx247:
The 3.32 and the 4.10 only came in 84, and they are weak, no webbing on the case. They work fine with a duke.
On the V6 muncie the case is webbed and (IIRC) I think the gears are bigger, so is the diff. We were going to swap in a 4.10 gears once, opened both cases and decided that it would be a bad idea.
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Yeah, the V6 case is stronger. There isn't any difference in the gears. The V6 has the same 2nd gear ratio, but different tooth counts than the 4 cylinder cars. That's it. The widths of all the gears are the same between the two applications.
The difference between the 4.10 output shaft and 3.65 output shaft is that the 3rd/4th gears are separate on the 4.10 and a single unit on the 3.65.
The 4.10 is going to have a smaller pinion than 3.65... that's just the way it works.
I've built a FrankenMuncie with 3.32 and econo 3rd/4th gear with V6 1st/2nd in a V6 case.
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weaselbeak
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MAY 21, 11:43 PM
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I am of the opinion that the strongest is the Muncie 3.65. I find the gear spacing perfect as well.
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darkhorizon
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MAY 22, 08:51 AM
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Having been around awhile I saw more unexplained random gear failures out of the 4speeds than the 282s. The 282 saw more power for longer than any of the broken 4speeds.
4speed gearing is sweet.
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Will
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MAY 22, 09:23 AM
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| quote | Originally posted by darkhorizon:
Having been around awhile I saw more unexplained random gear failures out of the 4speeds than the 282s. The 282 saw more power for longer than any of the broken 4speeds.
4speed gearing is sweet. |
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I haven't driven one, but I'd expect that the FrankenMuncie with V6 first gear and 3.32 final would be about perfect for a turbo 3800.
The 282 gearing in the Fiero and other V6 cars is a little wonky with the 3.50/2.05 first/second set, BUT if you can find the fairly rare 3.50/2.19 set from early Quad 4 cars, it gets better. The less rare 1.02 fourth gear helps a lot also. I have both of these in the car now and have a 3.94 final on the shelf. The gearing changes had a surprisingly large effect on how much fun the car is to drive.
The 282 is definitely FAR and AWAY better engineered than the Muncie. The Muncie is a throw back to the 70's if not the 60's...[This message has been edited by Will (edited 05-22-2014).]
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onesexyfiero
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MAY 22, 12:20 PM
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If you go with a 4 speed for your 3800sc, keep it in mind when doing your exhaust. 2800 rpm at 65 with the typical super-short, no cat, hi-flow muffler exhaust setup most guys do on 3800's would not be an enjoyable experience in my opinion.
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mitchjl22
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MAY 23, 02:44 AM
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I got a pm asking to explain a bit more on what actually happened in the video.
My stock Getrag (Early Design) Screw in type dipstick, case broke on one of the mounting bolt locations.
I was trying to capture a video of some low >2° KR I was experiencing at 4K rpm in second gear. At about 30 sec into the video, you can see me stop pulling and look behind me. I saw what looked like a rock flip up into the air, now I know it was part of my 282 case.
-Mitch------------------
My Car - 87' GT 3800sc
http://www.fiero.nl/forum/F.../HTML/121571.html#p0
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Lou and Blue
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MAY 23, 07:07 AM
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I know I sound like a total dope here but what is KR?
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Gall757
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MAY 23, 08:26 AM
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+1
You don't sound like a dope at all.
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