Some 4 gear questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brainchild · 01-04-2005, 09:02 PM

Today the shifter in my 4 speed went to neutral,and the tranny stayed in 4th,which is a common thing in these old trucks,I've had it happen several times through the years.
Also it jumps out of 3rd,and idling along in Granny it just falls out of gear when I let off the gas.
Also it is really hard to get into 2nd sometimes unless I stop completely.

But it DOESN't make any noise

Is there anything I can do to make it work better with out swapping it out?
I am concidering a TH350 in the spring,which will prolly happen,so I just wanna improve performance until then.

Thanks

Brainchild · 01-05-2005, 02:07 AM

Ttt

68w/sbc406 · 01-05-2005, 02:14 AM

i had a SM465 and it never popped out of gear. i also couldnt get into second unless i was at a stop, but when i did you ate the dash. i finally pulled mine out when it started sticking in 4th??? i am sure the 4th gear starts i did were not good on the clutch

Brainchild · 01-05-2005, 02:34 AM

I can't wait till I can ditch this POS and get a nice automatic in it.I hate things that don't work right

4x4Poet · 01-05-2005, 02:56 AM

Keep the SM465. It's a great tranny. It does have a common weakness that usually pops up after many miles of normal wear and tear. Get it? "Pops up!"

OK, ok.

I pulled a quote from a homemade SM465 how-to overhaul site. "There are two snaprings which retain the input counter gear and the third gear countergear. They wear and allow the two to walk, which causes the transmission to jump out of gear. These are replaced with a spacer bushing (p/n 14020811 from Anaheim Gear, essentially tubing as far as I can tell)." It's overhaul time.

You can click on the entries on this site to get a word picture of how to overhaul the SM465 yourself. Images don't work though the markers are there. Downloads as a text doc for my mac:
SM465

I hate automatics.

Brainchild · 01-05-2005, 03:53 AM

I have pics on the PC,nice article.Thanks.
I like the 4 speed too,but I would enjoy the automatic being old and lazy

I have a couple of these around wit about the same problem,so I may just rebuild one and see how it goes.Never been into one,so I may have lots of parts

4x4Poet · 01-05-2005, 06:27 AM

Good. I'm glad you got pics.

Now I need to figure out some computer software or find a PC to print from. Doesn't help that I'm computer illiterate.

Dear 67-72ChevyTruck Board Members using Mac computers,

Can you download the above "SM465" linky pages with pics? And show me how to?

01-04-2005, 09:02 PM	#1
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	Some 4 gear questions Today the shifter in my 4 speed went to neutral,and the tranny stayed in 4th,which is a common thing in these old trucks,I've had it happen several times through the years. Also it jumps out of 3rd,and idling along in Granny it just falls out of gear when I let off the gas. Also it is really hard to get into 2nd sometimes unless I stop completely. But it *DOESN't* make any noise Is there anything I can do to make it work better with out swapping it out? I am concidering a TH350 in the spring,which will prolly happen,so I just wanna improve performance until then. Thanks __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

01-05-2005, 02:07 AM	#2
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	Ttt __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

01-05-2005, 02:14 AM	#3
68w/sbc406 Got Light Emitting Diode? Join Date: Apr 2004 Location: Newberg, OR Posts: 2,485	i had a SM465 and it never popped out of gear. i also couldnt get into second unless i was at a stop, but when i did you ate the dash. i finally pulled mine out when it started sticking in 4th??? i am sure the 4th gear starts i did were not good on the clutch __________________ 1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's(the family car) 1993 Cherokee work ride/weekend wheeler

01-05-2005, 02:34 AM	#4
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	I can't wait till I can ditch this POS and get a nice automatic in it.I hate things that don't work right __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

01-05-2005, 02:56 AM	#5
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Keep the SM465. It's a great tranny. It does have a common weakness that usually pops up after many miles of normal wear and tear. Get it? "Pops up!" OK, ok. I pulled a quote from a homemade SM465 how-to overhaul site. "There are two snaprings which retain the input counter gear and the third gear countergear. They wear and allow the two to walk, which causes the transmission to jump out of gear. These are replaced with a spacer bushing (p/n 14020811 from Anaheim Gear, essentially tubing as far as I can tell)." It's overhaul time. You can click on the entries on this site to get a word picture of how to overhaul the SM465 yourself. Images don't work though the markers are there. Downloads as a text doc for my mac: SM465 I hate automatics. __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

01-05-2005, 03:53 AM	#6
Brainchild Still drivin' a Rat Rod Join Date: Sep 2004 Location: Monett Missouri Posts: 4,925	I have pics on the PC,nice article.Thanks. I like the 4 speed too,but I would enjoy the automatic being old and lazy I have a couple of these around wit about the same problem,so I may just rebuild one and see how it goes.Never been into one,so I may have lots of parts __________________ Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the a$# 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website

01-05-2005, 06:27 AM	#7
4x4Poet Registered User Join Date: Nov 2004 Location: "Under Montana skies." Posts: 1,836	Good. I'm glad you got pics. Now I need to figure out some computer software or find a PC to print from. Doesn't help that I'm computer illiterate. Dear 67-72ChevyTruck Board Members using Mac computers, Can you download the above "SM465" linky pages with pics? And show me how to? __________________ '71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.

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