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 Post subject: 6 speed swap
PostPosted: Wed Mar 22, 2017 
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Idling
Idling

Joined: Jan 2004
Posts: 275
Location: Sarasota
Model Year: 2001
Anybody done a switch from a 6speed tranny to a 5 on an NB .... issues, things that need to be done or watched for?

Bill

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Emerald 2001 LS FM2, Wisco pistons, Carrillo rods, FM springs and sways, AGX shocks,BSP duals
" Grab the Duck Tape my heads about to explode! "


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 Post subject: Re: 6 speed swap
PostPosted: Wed Mar 22, 2017 
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Engine Blown
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Joined: Feb 2003
Posts: 16989
City: Safety Harbor
Name: Loren
Model Year: 2001
Hi, Bill!

Should be a direct bolt-in swap.

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 Post subject: Re: 6 speed swap
PostPosted: Thu Mar 23, 2017 
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Idling
Idling
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Joined: Jul 2009
Posts: 398
Location: Plant City
Model Year: 1996
Shifter will be different. Aside from that it's exactly as Loren said.

What are your plans for the 6 speed? I might need a spare.

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Steve
'96 Turbo Trackhoe, GTX2867R, 326whp/308wtq, MS3 Basic, Wilwood 11.75, MSM Bilsteins, 550/350, etc.


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 Post subject: Re: 6 speed swap
PostPosted: Thu Mar 23, 2017 
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Idling
Idling

Joined: Jan 2004
Posts: 275
Location: Sarasota
Model Year: 2001
From what the mechanic said its a couple bearings that a need to be replaced on the 6.... I mentioned it to a friend that is a service manager for a mazda dealer, He's going have some of his guys go thru it (they need the practice) and if its only a couple bearings, he will only charge me for the parts :) .... don't know what Ill do with after that. Ive always wanted to see the deference be the 5 and 6 speeds with the turbo... the 6 speed 1st gear is almost useless. If I like the 5 I"ll probably sell the 6 speed. Ill keep ya updated

Bill

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Emerald 2001 LS FM2, Wisco pistons, Carrillo rods, FM springs and sways, AGX shocks,BSP duals
" Grab the Duck Tape my heads about to explode! "


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 Post subject: Re: 6 speed swap
PostPosted: Thu Mar 23, 2017 
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TBM Admin
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Joined: Nov 2002
Posts: 18816
Location: Seminole/Largo, FL
City: Largo
Name: Mark
Model Year: 1999
My least favorite thing about my MSM was the 6-speed because of the short gearing. Before I went FI on my 99 I seriously considered swapping out the transmissions between them.

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 Post subject: Re: 6 speed swap
PostPosted: Fri Mar 24, 2017 
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Clutch In
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Joined: May 2013
Posts: 68
City: Sebring
Name: Joe
Model Year: 2001
Not to get to far away from the thread but, isn't the 6 speed stronger and preferred by FI car owners?


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 Post subject: Re: 6 speed swap
PostPosted: Fri Mar 24, 2017 
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Joined: Nov 2002
Posts: 18816
Location: Seminole/Largo, FL
City: Largo
Name: Mark
Model Year: 1999
The one from the MSM was supposedly, can't say for the standard 6spd.

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 Post subject: Re: 6 speed swap
PostPosted: Sat Mar 25, 2017 
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Idling
Idling

Joined: Apr 2015
Posts: 274
City: Lakeland
Name: Jim
Model Year: 2002
Funny this thread popped up, as I have recently been daily'ing the Miata, and considered a 5-speed swap. I *think* from what I have read, that the top gear in a 5-speed is higher vs the 6-speed. Coupled with my 3.90 axle, it should be better, although as pointed out the 5 is not as strong. I do have a turbo planned for the future but it'll be limited to low boost (~10lbs, and stay that way)


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 Post subject: Re: 6 speed swap
PostPosted: Sat Mar 25, 2017 
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Accelerating
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Joined: Oct 2013
Posts: 506
Location: NE St. Pete.
City: Grove City
Name: Steve
Model Year: 1996
ALSMedic wrote:
it'll be limited to low boost (~10lbs, and stay that way)

HaHa. I've heard that one before.

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 Post subject: Re: 6 speed swap
PostPosted: Mon Mar 27, 2017 
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Idling
Idling

Joined: Apr 2015
Posts: 274
City: Lakeland
Name: Jim
Model Year: 2002
Quote:
HaHa. I've heard that one before.


No, really, Ive had much higher horsepower cars before, even higher HP-weight ratio cars before. I really only want ~200hp. I dont want to be anywhere near the threshold of parts reliability.


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 Post subject: Re: 6 speed swap
PostPosted: Mon Mar 27, 2017 
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TBM Admin
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Joined: Nov 2002
Posts: 18816
Location: Seminole/Largo, FL
City: Largo
Name: Mark
Model Year: 1999
ALSMedic wrote:
Quote:
HaHa. I've heard that one before.


No, really, Ive had much higher horsepower cars before, even higher HP-weight ratio cars before. I really only want ~200hp. I dont want to be anywhere near the threshold of parts reliability.


If you're only looking at 200rwhp the 5speed would e more than fine.

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 Post subject: Re: 6 speed swap
PostPosted: Tue Mar 28, 2017 
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Idling
Idling
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Joined: Jul 2009
Posts: 398
Location: Plant City
Model Year: 1996
I was running ~240whp on the 5 speed for a while without issues. I actually don't like the 6speed but had to have it for over 250whp. The 5 speed had much better feel to the shifter and didn't weigh as much. I had to change to the 3.63 rear gears to make all 6 gears properly usable and give me the top end for Daytona. And I needed to spend a bunch of extra money to switch to the MR shifter to help keep from missing shifts and I still miss them occasionally. I really miss the 5 speed. But I believe I'll be needing a spare 6 speed eventually. This one sounded a little worn from the moment I got it.

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Steve
'96 Turbo Trackhoe, GTX2867R, 326whp/308wtq, MS3 Basic, Wilwood 11.75, MSM Bilsteins, 550/350, etc.


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 Post subject: Re: 6 speed swap
PostPosted: Thu Mar 30, 2017 
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Idling
Idling

Joined: Apr 2015
Posts: 274
City: Lakeland
Name: Jim
Model Year: 2002
The biggest problem with my 6-speed is the way it shifts. Its a little notchy going into second and third, and worse when cold. By cold, I mean almost anytime it hasnt been run in the last three hours- not necessarily sub 40 degrees or anything "cold" outside. Once its run down the road for at least 20 miles it does get alot better.

I put Mobil1 synthetic lube in it ~12k miles ago, not really knowing about the Motorcraft magical lube. My Jeep wrangler uses ATF in the manual gearbox. Originally it called for gear lube but it has been superceded by ATF per Jeep. I added about a half pint of ATF to my 6-speed and it did actually help. The ATF is supposed to be good for yellow metals like synchos in manual gearboxes. I often think about trying 100% ATF in the Miata box. I think Ford uses ATF in Mustang 5-speed boxes too.

When I finally get around to installing the clutch I bought 6 months ago, I'll at least change the fluid again, to Amsoil, Motorcraft, more Mobil1, or something "good" and see if fresh fluid helps it any.


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 Post subject: Re: 6 speed swap
PostPosted: Thu Mar 30, 2017 
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Idling
Idling
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Joined: Jul 2009
Posts: 398
Location: Plant City
Model Year: 1996
If your oil is too slick the synchros don't make enough friction to slow the gears to quickly match each other. If it is too thick there is too much drag which makes it feel heavy and also slow to shift. Fluid definitely makes a difference in feel. I'm still experimenting at this point.

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Steve
'96 Turbo Trackhoe, GTX2867R, 326whp/308wtq, MS3 Basic, Wilwood 11.75, MSM Bilsteins, 550/350, etc.


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 Post subject: Re: 6 speed swap
PostPosted: Wed Apr 19, 2017 
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Idling
Idling

Joined: Jan 2004
Posts: 275
Location: Sarasota
Model Year: 2001
Update.... after replacing the 6 speed with a 5 speed the vibration and noise continued ](*,) . Retuned it to the mechanic to have them look over again :roll: .... This time, they diagnosed it as the rear end. After pulling it apart many little bits of gear came out :? Soooo if anyone knows of a 3.9 rear end available let me know.
Thanxs

Bill

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Emerald 2001 LS FM2, Wisco pistons, Carrillo rods, FM springs and sways, AGX shocks,BSP duals
" Grab the Duck Tape my heads about to explode! "


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