4speed to 3speed questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*Tanker350* · 02-07-2004, 03:14 AM

Is there anyone that has switched from a four speed on the floor, to a three speed? I just did that and need help with the reverse lights and brake lights. The wiring was on the old tranny and now that I have a three speed it doesnt allow for it, I assume b/c in 68 where I got the tranny, it is mounted on the column. So what do I have to do to get these working again? Thanks if you have any help.....

Bowtie67 · 02-07-2004, 07:38 PM

Are you talking about a three speed auto? If so yes it's on the column, Manual 3 spd I believe was also mounted on trans. I pulled a 3spd column out of my truck and don't remember any BU switches there. As far as Brake lights these are usually mounted up under dash by brake pedal Assembly..

Waylon Hoge · 02-08-2004, 09:46 PM

The brake lights are turned on by a switch at the top of the brake pedal. When you push the brake, the button on the switch will extend out and turn your brake lights on. When the brake is released the button will push in and turn the lights off. You should have a switch by your shifter that will work in the same way, but the button will be pushed in.

*Tanker350* · 02-10-2004, 09:11 PM

Sorry about not being clear. I had a 4 speed manual, and went to a 3 speed manual also. The brake light I can do, what about my reverse lights?

bad 71 chevy · 02-10-2004, 09:24 PM

my reverse lights dont work on my 3 speed after the moter swap and i dont know i have one wire that we did not put back but we dont know where to put it so i still have no clue

Bowtie67 · 02-10-2004, 09:36 PM

If there is only one wire down by the trans for the backup lights it should be ground, you should have 2 wires to the swtich if this being the case one will be grounded and then to switch the other will be the ground to the backup lights.
or
there should be a hot wire to switch and other wire from switch should go to backup lights

.

JimKshortstep4x4 · 02-10-2004, 09:48 PM

If you went to three on the tree then the switch is on the column. ( on the 71-2's, not sure on the 67-70). It is located similar to the neutral safety switch on the automatics. I have a switch if you need a pic of one, let me know.

Jim

*Tanker350* · 02-13-2004, 04:57 AM

If you don't mind I would like to see the pic. Thank-you

02-07-2004, 03:14 AM	#1
Tanker350 Account Suspended Join Date: Dec 2003 Location: Palm Desert, Ca Posts: 410	4speed to 3speed questions Is there anyone that has switched from a four speed on the floor, to a three speed? I just did that and need help with the reverse lights and brake lights. The wiring was on the old tranny and now that I have a three speed it doesnt allow for it, I assume b/c in 68 where I got the tranny, it is mounted on the column. So what do I have to do to get these working again? Thanks if you have any help..... Last edited by Tanker350; 02-07-2004 at 06:09 PM.

02-10-2004, 09:24 PM	#5
bad 71 chevy Registered User Join Date: Jun 2000 Location: Omaha NE 68122 Posts: 637	my reverse lights dont work on my 3 speed after the moter swap and i dont know i have one wire that we did not put back but we dont know where to put it so i still have no clue __________________ 71 Chevy C/10 lwb 350 5 speed nv3500 3.73 rear end 2.5" Front Drop and 4" in the back Edelbrock perfomer rpm manifold Edelbrock 600 cfm carb Headmen headers

02-07-2004, 07:38 PM	#2
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	Are you talking about a three speed auto? If so yes it's on the column, Manual 3 spd I believe was also mounted on trans. I pulled a 3spd column out of my truck and don't remember any BU switches there. As far as Brake lights these are usually mounted up under dash by brake pedal Assembly..

02-08-2004, 09:46 PM	#3
Waylon Hoge Registered User Join Date: Mar 2003 Location: Hoschton, GA Posts: 12	The brake lights are turned on by a switch at the top of the brake pedal. When you push the brake, the button on the switch will extend out and turn your brake lights on. When the brake is released the button will push in and turn the lights off. You should have a switch by your shifter that will work in the same way, but the button will be pushed in.

02-10-2004, 09:11 PM	#4
Tanker350 Account Suspended Join Date: Dec 2003 Location: Palm Desert, Ca Posts: 410	Sorry about not being clear. I had a 4 speed manual, and went to a 3 speed manual also. The brake light I can do, what about my reverse lights?

02-10-2004, 09:36 PM	#6
Bowtie67 Registered User Join Date: Jan 2004 Location: NH Posts: 2,266	If there is only one wire down by the trans for the backup lights it should be ground, you should have 2 wires to the swtich if this being the case one will be grounded and then to switch the other will be the ground to the backup lights. or there should be a hot wire to switch and other wire from switch should go to backup lights .

02-10-2004, 09:48 PM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	If you went to three on the tree then the switch is on the column. ( on the 71-2's, not sure on the 67-70). It is located similar to the neutral safety switch on the automatics. I have a switch if you need a pic of one, let me know. Jim

02-13-2004, 04:57 AM	#8
Tanker350 Account Suspended Join Date: Dec 2003 Location: Palm Desert, Ca Posts: 410	If you don't mind I would like to see the pic. Thank-you



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