Ok so honestly there are tons on here that have a 3800sc in their Fiero but how many of you guys actually are using the Muncie 4 speed with it. I have been trying for about a month now on finding a getrag or a f23 either not having any luck. I have a early 86 gt that has a Muncie 4 speed in it and a low miles 65k 3800sc that I got for 300 bucks with harness and ecm. I want to swap this motor in but like said want to go 5 speed. I want to know how actually driving the 3800sc would be. Would it be boosting the whole time on the highway? How would gas mileage be with it? Just overall driving experience. I daily my 2.8 4 speed now but i want some actual get up and go that can keep up with most 4 cylinders today and I feel the 3800sc would be best chose. I plan doing small mods to the 3800 from zzp performance nothing major like cam and head work just the small stuff well fill me in ladies and gents and thanks for all the help in advance
Many people actually prefer the 4 speed with the 3800. It is probably the strongest choice and with the extra torque, first gear runs out pretty quick on a 5 speed.
[This message has been edited by Gall757 (edited 04-21-2020).]
I thinking of a fun cruiser though, highway driving and around town with it. I would like to daily it but don’t want it to be screaming or boosting the whole time
Just swapped a 3800SC into my 84 Fiero that has a 4:10 4 speed. My plan is to daily drive it. I’ve only put about 5 miles on it so I can’t really tell you how daily driving it is yet. Seems good the small amount I’ve driven it.
I would like to add, I have my cradle ready with the 3800SC Series 2 and the ‘85-‘86 Muncie M17 (ribbed case, not the smooth case). I have heard many good things about the 4 speeds (M17) handling the torque well, some even say they hold up better than 5 speeds (I take what I’ve heard to be true, maybe it’s an opinion, but they both seem to be very good options). I can’t say how it is driving and how it is on the highway (since my Fiero isn’t done, and hasn’t seen the road since I took it apart) but I have heard good things about both transaxles and in my opinion from what I have done research on, I went with the 4 speed. But I still would like to hear opinions from others and their experience as well.
Ron
[This message has been edited by Fiero Ron (edited 04-21-2020).]
If you are not going to be traveling interstates, the M17 four speed has much better gearing, and it handles the torque better than the Getrag. The routing of the shifter cables can be problematic if using the stock 3800 crossover pipe.
[This message has been edited by olejoedad (edited 04-22-2020).]
I had a 4 speed Muncie behind a 3800 SC for years and loved it. Routinely got 30 plus mpg on the highways. It was a bit loud but it didn't bother me. I'm in the process of swapping a Series II into another Fiero but with a getrag this time and I'm not sure I'm going to like it. What I do like tho is not having to F with the 4 speed cable position. If you have a 4 speed I would just stick with it.
Hmmmm that’s weird cause my tach must be way the hell off then cause at 70 I’m at 3500-4000 rpm. I will go with the 4 speed I travel 40-45 miles to work but I don’t really care cause it only cost 15-20 dollars to fill the tank of a Fiero so no complaining. Now main concern is what clutch would i use one from a 97-02 3800 f body would that handle a small super charger pulley slight bigger injectors, and ignition set up I don’t mine being in the 235-270 hp wheel power cause I know in the Fiero that will be insane anyway. Yes 300 would be nice but I got a 4.8 t56 gta for that kind of fun
Ok so for now I’m running a 2.8 4 speed do you guys think it’s the tach filter and the gauge cause I’ll order a new filter from the fiero store and get a gauge from a 86 SE from a local yard that I just found
i'm putting in a 3800 SC from a 2002 GTP and i have all three 4 speed trannies. My original intention was to use the MY8 tranny for the swap, but then a friend turned me onto the idea of making a frankentranny using the 3,4 an final drive gear from the My8 and the 1,2 and case from the M17. Pretty sure i could pull it off if i had a press to remove and install the gears. Maybe this winter i will attempt it, when i pull apart the M17 to see how daunting it is. There is a thread on the forum here about how to do this.
jon
------------------ Astronomy says we will find a coded signal from outer space. Then we'll KNOW that life exists there, for coded signals aren't by chance.
Biology says there are coded genetic signals in every cell, but we KNOW that no intelligence created life.
I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun!
I have a hybrid Muncie 4spd in my 3800SC 84 SE. I wanted the 4spd strength but also good on the highway. After driving it for 2 years with the Duke and the 4:10 I knew that gearing was too low and planned my swap and bought an MY8 from someone here on the forum. I also bought an M17 to complete the build as per the thread here on the forum. The end result is great. 2300 RPM @ 70mph and about 28mpg highway and 22-24 local depending on how I drive it. Grew up driving a 4spd and I love it. Well suited to the L67 power curve. It does take more effort that just buying a 5 spd but it also makes it different. It did require I modify the shift cable braket and one of the levers to keep the cables clear of the crossover pipe. I also wrapped the with a heat insulator. 3 years and 12K later all is great.
larafan: Thanks for the pic and the encouragement to do a hybrid. i'm gonna tear down the M17 to see how hard it looks before undertaking a hybrid. How did you do the spacers?
jon
------------------ Astronomy says we will find a coded signal from outer space. Then we'll KNOW that life exists there, for coded signals aren't by chance.
Biology says there are coded genetic signals in every cell, but we KNOW that no intelligence created life.
I'm the original owner of a white ' 84 2M4 purchased Dec 10, 1983 from Pontiac. Always garaged, no rust, 4-wheel drifts are fun!
Bought the Kent Smith tool used on eBay and used it and re-sold it. It's listed in the thread on the build. It really was easy to do following step by step from the thread. Also having a friend to help you keep things straight and 2 separate areas so you can keep the parts organized. In the end everything went together with the shims that were in the M17 originally.
[This message has been edited by larafan (edited 04-23-2020).]
Oops, this is exactly the social faux-pas I was trying to avoid.
I sent this by accident.
----- Message Forwarded from pmbrunelle ----- You may want to consider modifying (or building a new one) the crossover pipe and leaving the shift cables alone.
For the shift linkage, I think it would be ideal if the cables came in at a straight angle, like the stock setup does. If they came in crooked, they would be forcing the shift levers in a sideways (undesired) manner.
Larafan's solution probably works... I just don't think it's the ideal solution. I didn't feel like sharing this opinion on the thread, as larafan may have taken it personally. So after 7 years on this forum of gaining and sharing I accidently received the above private message meant for the OP from pmbrunelle. I shared my experience in answer to the OP's request. If someone has a differing opinion or experience why not share that information and or have a discussion about the differing opinion. But someone who doesn't know me or my qualifications does it this way. Now we all know your opinion.
So after 7 years on this forum of gaining and sharing I accidently received the above private message meant for the OP from pmbrunelle. I shared my experience in answer to the OP's request. If someone has a differing opinion or experience why not share that information and or have a discussion about the differing opinion. But someone who doesn't know me or my qualifications does it this way. Now we all know your opinion.
I am surprised that no one mentioned using a Getrag out of a early 90's Beretta or a Corsica with the V6 and a 5 speed Trans ( must be the V6 engine only). You just need to get the shift linkage converter and trans mounts from Rodney. The are very strong. I have one in both the 4.9 and the 3.4 DOHC that I have.
I thought about doing that as well but I’m trying to do this 3800 swap on budget and with less modded aftermarket parts. I’m just going to stick it out with the 4 speed I don’t mind the 4 speed at all actually. I just need to replace my tach I guess before doing the swap.
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